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# Target IIT-JEE (Chat Room)

Since we have to compete in jee in an all India level , it is quite obvious that we want the views of others , we want to know about our competitors.

So I have created this as a Communication platform for all those preparing for IIT - JEE.

• You can talk to the ones personally by mentioning their link. And giving them the time when you will be online .

• you can ask general questions.

• you can keep your communication personal by deleting it after your work is over.

• Anyone can join this chat room and can even invite his friends . For joining just save this note with you (optional).

• You can even ask your doubts. In any chapter(Restriction :you cannot discuss solution to Brilliant questions here , but you can share the link and ask them to come there )

• I see ,we don't always get a reply to our question , but if we all be at a single chat room we would definitely get a reply

Note : This chat room is also started on slack , There we can communicate better!!! To join slack click here

Note by Aniket Sanghi
5 months, 1 week ago

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Doubt:

A uniform rid of length L lies on a smooth horizontal table.A particle moving on the table strikes the rod perpendicularly at one end and stops. Find the distance travelled by the center of rod by the time it turns through a right angle. · 5 months, 1 week ago

Use the following equations to find $$\omega$$:

1. Conservation of linear momentum

2. Conservation of angular momentum (about a point just above the COM of the rod, in the air, so that the point taken is stationary wrt ground and there is no angular impulse)

Then use $$\theta = \omega t$$ to get the time taken by it to rotate through $$\theta$$

And finally, $$S = v t$$, where $$v$$ is the velocity of the COM of the rod after collision, to find the distance travelled · 5 months, 1 week ago

Ohk got it!

Thanks a ton. · 5 months, 1 week ago

RM is tough right? :( I hardly solve few fully independently. · 5 months, 1 week ago

Same here :(

Noatter how hard I try, I can't do physics independently without any aid. · 5 months, 1 week ago

No problem. Glad to help. · 5 months, 1 week ago

What is the exam pattern of JEE 2017? · 5 months, 1 week ago

you never know jee pattern even 1 day before JEE exam (adv. obviously!) · 5 months, 1 week ago

Yes you are right. No one expected last year's pattern. · 5 months, 1 week ago

What is the exam pattern of JEE 2020? :P · 5 months, 1 week ago

What is the exam pattern of JEE 2018? · 5 months, 1 week ago

General question:

We all are usually confused whether the book we are referring is nice or not.........especially in the critical month before jee advanced.........let's here share the books we prefer along with a reason why we prefer it · 5 months, 1 week ago

Maths - cengage (lot of q to practice along with solutions)

Physics - cengage (lot of q to practice along with their solutions, nice theory )

Chemistry-

Physical- P bahadur (Everything in few pages)

Inorganic - NCERT ( Best explanation)

Organic - Cengage ( Authentic theory) · 5 months, 1 week ago

Physics- HC Verma (Most Authentic Theory and No errors at all and best theoretical Problems are framed from It Only) DC Pandey (Practice Nice questions with solutions)

Chemistry- RC Mukherjee (Physical- Has Almost all the variety of problems and important concepts)

Solomon's And fryhle (Organic- Detailed Explanantion and nice subjective problems)

Inorganic- its none of my buisness ! :P (but still i like ncert)

Maths- I dont get time to solve problems of maths from books (my coaching sheets, packages and archive are more than enough i think)

But still i refer to TMH For algebra for some mind bending problems and arihant for calculus for good explanation of concepts · 5 months, 1 week ago

@Prakhar Bindal what is the color of the cover page of soloman and fryle · 5 months, 1 week ago

Green

This book

http://www.amazon.in/Solomons-Fryhles-Organic-Chemistry-Advanced/dp/8126541814?tag=googinhydr18418-21 · 5 months, 1 week ago

What about the red one? · 5 months, 1 week ago

My teacher Suggested to use this as original solomon's has some portion out of JEE Syllabus. Also he gave us a option between Solomon and Morrison And Boyd. My friends are using Morrison and they are finding that useful. I Also saw the book and seemed nice. Also Similar to solomon morrison has a lot of portion not in our syllabus so our teacher recommended to use solomon only but if not available then he said to go for morrison and boyd

http://www.flipkart.com/organic-chemistry-english-7th/p/itmdmyjz99fnszs6 ]\ · 5 months, 1 week ago

What is your position in your class and what is your confidence level in organic · 5 months, 1 week ago

@Prakhar Bindal I have found a mistake in HC Verma. · 5 months, 1 week ago

Can you tell where? ( My Sir told that HC Verma Is 99.9% Authentic) · 5 months, 1 week ago

One is in the capacitor chapter .The other is in the SHM chapter,the question where two wheels are rotating and a rod is placed on it,the direction of rotation is given wrong (this question was copied wrongly from irodov.) · 5 months, 1 week ago

can you tell, which one in capacitor is wrong, i agree with the second one , i solved it from irodov. · 1 week ago

@Prakhar Bindal Bhaiya, What about theory of Physical Chemistry? RC Mukherjee has little theory, will it be sufficient with my coaching packages and NCERT? · 5 months, 1 week ago

Well I Never needed any book for theory in physical. NCERT Is nice. If you want some more theory then i would Suggest to go for OP Tandon Or P Bahadur (OP Tandon's physical is nice DONT Ever buy its organic book it would make your head go round!! ) · 5 months, 1 week ago

P bahadur would be nice for theory · 5 months, 1 week ago

same here but I prefer Ms Chauhan for organic · 5 months, 1 week ago

Physics- HC Verma , i.e irodov (sometimes) ,arithant publication by d.b. singh (head of science centre kota) vidyamandir modules, past 37 year iit jee questions, NCERT chemistry- i'm very poor at it, i don't really care but sometimes read my modules. NCERT maths- vidyamandir modules, past 37 year papers , TMH ,NCERT higher algebra (hall and knight) i'm not that much of a studious kid :) · 1 week ago

@Aniket Sanghi @Prakhar Bindal Thank you both :D · 5 months, 1 week ago

I would say,

Maths-Cengage(JEE type questions)

Physics-Resnick Halliday,Feynman(awesome concepts),HC Verma(conceptual questions),DC Pandey(JEE type),Irodov,Krotov(for high thinking)

Inorganic Chemistry-JD Lee(concepts),OP Tandon(mostly for facts)

Organic Chemistry-Solomons(concept),Himanshu Pandey(many JEE type questions)

To be honest, for physics, every book copies from Irodov,Krotov,Resnick Halliday(including HC Verma,DC Pandey) so I would suggest to solve many questions from these books even if they are difficult. · 5 months, 1 week ago

How many of you give full tests of Fiitjee?

Particularly of 25th april 2016 · 5 months ago

mention some names to make them aware · 5 months ago

I don't know who all do.

Leave it · 5 months ago

Salute to the person who got the idea to Cretate this chat room . please can anyone tell the person who created this chat room . a wonderful idea . thank-you this chat room helped me a lot · 5 months, 1 week ago

Thanks! I hope it will be helpful to all :) · 5 months, 1 week ago

I want to clear a doubt in this question

Thanks. · 5 months, 1 week ago

Is there any PDF or eBook which can help me improve my Coordinate Geometry for JEE Advanced? Since it's right around the corner and is generally where I lose marks in Maths, I'm wondering if there is any such resource or even a good question bank or something of the sort which can help me make it my strong point (most people say it's the easiest part of Maths). · 5 months, 1 week ago

A good mechanics problem :

A weightless rod of length $$l$$ with a small load of mass m at the end is hinged at point as shown in the figure and occupies a strictly vertical position, touching a body of mass M. A light jerk sets the system in motion. For what mass ratio M/m will the rod form an angle $$x = 30 ^{\circ}$$ with the horizontal at the moment of the separation from the body?What will be the velocity u of the body at this moment? Friction should be neglected.

@shubham dhull @Prakhar Bindal @Aniket Sanghi · 2 days, 13 hours ago

M/m = 4 v = (1/2)(gl/2)^0.5 · 2 days, 12 hours ago

why don't u come over slack ? · 2 days, 12 hours ago

Comment deleted 2 days ago

Sry I didn't knew that this prob was already posted on b'llant. · 2 days, 11 hours ago

can u give link to prob plz · 2 days, 12 hours ago

I can't do that ! As that would be cheating ;) · 2 days, 12 hours ago

just the link? · 2 days, 12 hours ago

1st tell me , why do u want that? · 2 days, 12 hours ago

to solve it myself · 2 days, 12 hours ago

Which Resnick Halliday is better? The one written exclusively for jee advanced or one which is not? · 5 months, 1 week ago

Best is Resnick Halliday Crane ( I will not suggest Walker neither do I criticise it). · 5 months, 1 week ago

Go for the original one. That'll help you for NSEP+JEE. · 5 months, 1 week ago

https://www.flipkart.com/physics-volume-i-5th-english/p/itmdytmvygedvpch?pid=9788126510887&lid=LSTBOK9788126510887QNNK0T

Is this good? · 5 months, 1 week ago

I have Resnik Walker Hallinday. This is different. I have an old book. So I don't know about the new one. · 5 months, 1 week ago

OK so do you find it useful?

If you have few mins to spare, can you please give me a review about your book? Thanks! · 5 months, 1 week ago

Yes it was useful only for theory. Good for clearing concepts. · 5 months, 1 week ago

Ohk thanks! Clearing of concepts is what I need! · 5 months, 1 week ago

I see that many students find themselves weak in chemistry , so, let's practice chemistry

A person who will answer the question correctly with its solution will have the right to post the next question, followed by another.and sequence would go on ............ · 5 months, 1 week ago

1 st question : how many radial nodes are present in the orbital represented as : n = 5 , l = 2 , m = 0. · 5 months, 1 week ago

number of radial nodes = n-l-1 = 2.

Number of angular nodes = l = 2

Total Nodes (Excluding the one at infinity) = 4

Total Nodes (Including Infinity one) = n = 5 · 5 months, 1 week ago

dz2 has no nodal planes it has two nodal conical surface.. · 5 months, 1 week ago

Can You Please elaborate? and can you tell from where can i learn these things about nodal planes,nodes etc? · 5 months, 1 week ago

i learnt it from J.D.Lee(inorganic chem book)(i have the orange one but if you have black you can post hundreds of question which would have 0 solvers but its not for jee orange one is) but for now you may look "https://www.physicsforums.com/threads/classifying-electron-orbitals-by-nodes.621771/". · 5 months, 1 week ago

So should I prefer orange or the black one for jee or is their any other (JD lee) please can you share the

@aryan goyat @Mayank Singh · 5 months, 1 week ago

I've black · 5 months, 1 week ago

Is that better than orange one? What's your analysis · 5 months, 1 week ago

never ceen the orange · 5 months ago

if you love doing chemistry and really enjoy the inorganic part go for black i also wanted to have it but i didn't knew at that time. But it has some topics which jee does not test. · 5 months, 1 week ago

I want to be confined with jee syllabus and don't want to miss anything , then which one to prefer · 5 months, 1 week ago

orange one :) · 5 months, 1 week ago

And what's your expected score in jee main · 5 months, 1 week ago

i am in 12 now and will appear for jee in 2017. · 5 months, 1 week ago

I too have orange one :) For JEE · 5 months, 1 week ago

Is the black one better or the orange one?

And were you knowing aryan goyat is of our age (I thought he is 1 year ahead) · 5 months, 1 week ago

it's the very basic of nodes , you can find it in the great " NCERT " textbook if you see it my bro. · 1 week ago

Right! Can you elaborate about nodal conical suface (I would like to know) · 5 months, 1 week ago

i hope you know the shape of 5dz2 orbital just make 2 cones such that it does not touch the electron density. you may google for the pics. · 5 months, 1 week ago

Wrong answer! · 5 months, 1 week ago

But why? · 5 months, 1 week ago

I think you didn't try my set ! · 5 months, 1 week ago

you have asked here radial nodes which is n-l-1 may it be 5z2. · 5 months, 1 week ago

What 5z2 · 5 months, 1 week ago

its 5dz2 . · 5 months, 1 week ago

It is definetely 5dz2 as m =0 is for dz2 · 5 months, 1 week ago

A common doubt : How to prepare inorganic chemistry and from where

@Sandeep Bhardwaj · 5 months, 1 week ago

What is adv. · 5 months, 1 week ago

What are you asking?? Be clear · 5 months, 1 week ago

I have 2 doubts. Firstly, in this Physics question question, the answer comes out as $$R^2 \sqrt{\frac{2 P \cdot g}{3T}}$$, right? Secondly, in this Maths question, is there any better way of solving it other than taking partial derivatives, solving the simultaneous equations in $$x,y$$ and plugging them in to get the answer? · 5 months, 1 week ago

For the first one,the answer comes out as $$\displaystyle {R}^{2}\sqrt{\frac{Pg}{3T}}$$ because, it is a bubble and as there are two layers, while solving we have to take $$2*2\pi*R$$. · 5 months, 1 week ago

Is reading NCERT for inorganic enough? · 5 months, 1 week ago

JD LEE + NCERT + Your institute's notes + Previous years papers = total JEE advanced inorganic chemistry · 5 months, 1 week ago

Thanks I was doing JD LEE now. I was not sure whether that level would come. Now I shall read it more seriously. · 5 months, 1 week ago

i dont think so · 5 months, 1 week ago

We are told that's enough for rest our fiitjee materials fill the vacant spaces · 5 months, 1 week ago

Nice · 5 months, 1 week ago

Comment deleted 5 months ago

Comment deleted 5 months ago

It would be called cheating if we post a solution to a brilliant problem here, moderators would delete it · 5 months, 1 week ago

Sorry Sir · 5 months, 1 week ago

Yes you are right. @Gauri shankar Mishra discuss the solution there itself. If you want you can tag someone you want. Please don't discuss solutions of brilliant problems here or else I shall delete them. · 5 months, 1 week ago

Sorry Sir · 5 months, 1 week ago

How is your study going? · 5 months, 1 week ago

Invitation to @Prakhar Bindal @Gauri shankar Mishra @Aditya Kumar @aryan goyat @Mayank Singh and all who are interested are welcomed · 5 months, 1 week ago

Thats a nice Initiative · 5 months, 1 week ago

Great work · 5 months, 1 week ago

@Anshul Sanghi @ANSHUL SHRIVASTAVA @Harsh Shrivastava @Ashish R. Nair @Naman jain @Hargun Singh @Jyotisman Das · 5 months, 1 week ago

@Adarsh Kumar @Kalash Verma @Nihar Mahajan · 5 months, 1 week ago

@Calvin Lin @Andrew Ellinor @Ronak Agarwal @Nishant Rai @Sandeep Bhardwaj @ Deepanshu Gupta @David Mattingly

You all are experts and our seniors, We need and expect help from you ............. · 5 months, 1 week ago

Sure. Always happy to help :) · 5 months, 1 week ago

@aryan goyat · 5 months, 1 week ago

A spring of mass m is pulled such that a given instant, velocity of both of its end is v in the opposite direction. Find the kinetic energy of the spring.

@Aniket Sanghi @Prakhar Bindal · 1 week ago

I will suggest you to join slack , there you will find many people online every time who will feel it their pleasure to clear yr doubts.

Its link is mentioned in this discussion start. · 1 week ago

i joined it but nothing happens at all . · 1 week ago

Thanks a ton guyz!

I hope I don't disturb you when I ask my doubts? · 1 week ago

Nahh its my free time. i am watching Taarak Mehta · 1 week ago

if it's your free time bonus: prove the result i am using. · 1 week ago

You can solve it by integration

Use the property : In spring the velocity of any element dx at a distance x from the point of non-zero velocity is proportional to x.

Now, find the kinetic energy of this element and then integrate to get net kinetic energy.

The property I told you above can easily be proved and I have proved it in one of your doubt discussion

@Harsh Shrivastava · 1 week ago

is'nt my method correct? · 1 week ago

You are Using one result to prove another. He wants the proof of the result you are preassuming to be true! · 1 week ago

You can assume that velocities to vary linearly along the length of spring. Hence consider an element at a distance x from one of the end of the spring , write its velocity as a function of x , Write its kinetic energy as 1/2dmv^2 and integrate from 0 to l to get total kinetic energy.

I Would say to remember this result as it is quite helpful in SHM Problems Involving spring with mass. But Derivation is Important too for Proper Understanding Purposes · 1 week ago

mv^2/6? · 1 week ago

Hey are free for next half hour?

I have a problem that's bugging me since evening.

A physics problem. · 1 week ago

Sorry but i am a bit busy these days (AIITS This monday + revision of class 11) . you can post here i will do as soon as i get some more time · 1 week ago

No prob :) · 1 week ago

i can help if you want ! · 1 week ago

Sure!Thanks!

I'll post the prob after 30 mins, havta go out. · 1 week ago

i think i have waited much than you said · 1 week ago

Sorry bro, net was down. · 2 days, 13 hours ago

ok i'll be waiting uptill then · 1 week ago

Correct! Please give a hint. · 1 week ago

yes me too mv^2/6 as you must be knowing the contribution of a spring in any energy is m/3. and if we break it in 2 parts , you can do it now hope it helps. · 1 week ago

Why is the contribution m/3? · 1 week ago

because of its twists and turns, the linear contribution of mass is only m/3 , you can google if there is any proof but it would be great if you try to remember it . hope it helps ! · 1 week ago

Can someone please post a solution to this problem . please!!!! · 4 months, 3 weeks ago

try this https://brilliant.org/problems/no-story-this-time/?ref_id=1178336 · 5 months ago

Again let it get some rating :P · 5 months ago

without rating , dont we get the credit · 5 months ago

u get 100 points · 5 months ago

ok ok · 5 months ago

Hey please can anyone help me with this

The number of normals to the curve 3y^3 = 4x which passes through (0,1) is

My Approach found at slope of normal at any point , wrote its equation and passed through (0,1) . i obtained a 5 degree equation!

Also i entered that equation into wolfram alpha which showed me that only 1 real root exists. How?

@Aniket Sanghi @rohit kumar @Mayank Singh @aryan goyat @Akul Agrawal · 5 months ago

Hey guys me and aniket had a discussion about this problem . We actually arrived at the answer but the only thing that is left is that we have assumed that atleast one normal will exist in the interval x>0 and y>0 . can we prove that the atleast normal has to exist in this interval? cant it be like no normal can be drawn to the curve

@rohit kumar @Mayank Singh @aryan goyat @Akul Agrawal @Aniket Sanghi · 5 months ago

Its quite easy to make graph of $${ y }^{ 3 }=\frac { 4 }{ 3 } x$$ (I am sure you can do it orally!). And as the function is monotonic, you can easily come to the answer (try once). · 5 months ago

Bhaiya i did not got the answer by your method but thought of another way. The 5 degree equation that i was getting was strictly increasing for all real numbers and when x tends - infinity it also tended to -infinity and similar was for +infinity case. Hence it will cross the x axis only once as function is monotonically increasing.

But i want to know your method as it seems quite short . Can you please elaborate ( i have just started learning calculus)

Thanks! · 5 months ago

Prakhar I didid it by graph , I first draw the graph of the eq. Then you can see that the graph changes its concavity at x= 0 so you can easily observe that it can have only one normal at x>0 (graph is monotonically increasing) · 5 months ago

What is relation between monotonicity and normals? . why will it have only one normal for x> 0 please explain · 5 months ago

Graph

Clearly y=0 (x axis) is normal at origin. Now see how normal changes as we move left or right( it would be easy to see this as function is monotonic). (As we move right, the y- intercept of normal will keep on increasing) · 5 months ago

but x axis does not pass through (0,1) · 5 months ago

Please can you be more detailed? i realized that function is monotonically increasing as first derivative >0

@Akul Agrawal · 5 months ago

Those who love chemistry are invited to try these (BEST OF JEE - ADVANCED) · 5 months, 1 week ago

Today Rajdeep Asked me a question in which we were required to compare the acidic strength of H2SO4 , HCl AND H3PO4. I Was quite easily able to tell that H3PO4 would be the weakest acid. but was struck in comparing acidic strength of H2SO4 And HCl. i searched internet and got confused as all give a different answer. can any one please help?

@aryan goyat t @Aniket Sanghi @rohit kumar @Aditya Kumar @Abhineet Nayyar · 5 months, 1 week ago

i think the book you mentioned above ie solomons can help , checkout the table within it it is H2SO4 which is more stronger.(table 3.1 in 10th edition) · 5 months, 1 week ago

Comment deleted 5 months ago

mines are similar to prakhar with an exception that in physics i don,t prefer books and in inorganic i stick to J.D.Lee(the best book in inorganic) · 5 months, 1 week ago

I thought you were 1 year ahead! Are you in fiitjee · 5 months, 1 week ago

yes fiitjee jaipur. · 5 months, 1 week ago

What's your AIITS Rank history · 5 months, 1 week ago

near 50s (average) · 5 months, 1 week ago

Comment deleted 5 months ago

and your histroy · 5 months, 1 week ago

Top 20s · 5 months, 1 week ago

please provide me the link of it. · 5 months, 1 week ago

https://www.quora.com/Why-is-hydrochloric-acid-stronger-than-sulphuric-acid-even-though-sulphuric-acid-should-dissociate-to-produce-more-hydrogen-ions · 5 months, 1 week ago

Common strong acids This is a list of strong acids with pKa < -1.74, which is stronger than the hydronium ion, from strongest to weakest. Perchloric acid HClO4 (pKa ≈ −10)[5] Hydroiodic acid HI (pKa = −9.3)[2] Hydrobromic acid HBr (pKa = −8.7)[2] Hydrochloric acid HCl (pKa = −6.3)[2] Sulfuric acid H2SO4 (first dissociation only, pKa1 ≈ −3)[6] p-Toluenesulfonic acid (pKa = −2.8) Organic soluble strong acid Methanesulfonic acid (pKa = −1.92) Liquid organic strong acid[7] Almost strong acids from wikipedia · 5 months, 1 week ago

That's the problem . I Looked up Wikipedia it says HCl which even confuses me more · 5 months, 1 week ago

Wikipedia is not authentic ,it can be edited! · 5 months, 1 week ago

My Book (Cengage (Authentic) ) says H2SO4(pKa = -9) is stronger acid than HCl (pKa = -7)

Different source may give different results as you may know acidity also depends on the solvent.....Like H2SO4 and HCL will differentiate equally in H2O (high dielectric constant) , so you can't use H2O to compare acidity. Similarly may be diff sources are based on diff solvents. · 5 months, 1 week ago

I Also Thought H2SO4 Because it is diprotic and high resonance on conjugate base let me assume it to be true as it is the same in solomons · 5 months, 1 week ago

@aryan goyat · 5 months, 1 week ago

u there? · 5 months, 1 week ago

yes · 5 months, 1 week ago

I Mean to say for pure rolling bottom most point must be at rest wrt the surface it is performing pure rolling also the conditon a = R*Alpha should get satisfied . How can they both be simultaneously True? · 5 months, 1 week ago

why cannot it be see the what we mean by a=alph*R is dv/dt=R.dw/dt

dv=Rdw

adding v to both side v+dv=Rdw+v

v+dv=Rdw+wR

v(after time dt)=w(after time dt)R · 5 months, 1 week ago

Ok . My confusion is basically that during pure rolling we say that point of contact remains at rest hence force of friction should not act but we take in several problems like i gave you the previous one · 5 months, 1 week ago

then why dont you look at the object just after a time dt you find that the object is not doing pure rolling so here comes friction within a negligible time interval which even we cant measure and we would have to say that both act simultaneously. · 5 months, 1 week ago

Ok . In the Football Question We Have said that as pure rolling has started after first collision with rough ground so the bottom most point must have come to rest and hence it will be at rest when it again collides with rough ground. Hence there is no reason why friction must act. Cant we compare the two cases?(This football one and situation that i gave you). here also Once pure rolling started on horizontal surface the bottom point comes to rest hence there is no reason why friction should act · 5 months, 1 week ago

next did you find any horizontal force which is making it out of rolling in time dt. · 5 months, 1 week ago

in case of football field just after time t however long or small it may be the sphere will go on pure rolling, however it is not so here even after a small time dt the pure rolling is off. · 5 months, 1 week ago

i think i need some rest . i will talk to you tomorrow in this regard as i am feeling exhausted. thanks for taking out your precious time and having discussion in my silly concept · 5 months, 1 week ago

as much i know "no question is a silly question" · 5 months, 1 week ago

I Have Done The Following Analysis.

For Pure rolling on horizontal surface

Case.1 An external force is acting

In This case friction may or may not act. It All depends on the point of application of horizontal force.

Case 2. An External Is Not Acting

In This Case Friction Should Not act if body is continuing pure rolling. Because Friction will provide a and alpha in same direction hence a= R*Alpha can never be true.And once pure rolling started friction Friction will become zero so as the condition remains true (now a and alpha will become zero as there is no force) hence it will continue on to uniform pure rolling ( not accelerated )

External force does not includes friction

Is This analysis correct? · 5 months, 1 week ago

absolutely correct. · 5 months, 1 week ago

Thanks a lot @aryan goyat because of you my rolling concept became clear · 5 months, 1 week ago

i told you earlier too no need of thanks. · 5 months, 1 week ago

Ab to tujhe samajh me aa gaya? · 5 months, 1 week ago

Yes i got it tujhe samjhana hi nahi aata :P · 5 months, 1 week ago

Maybe i am not good at explaining · 5 months, 1 week ago

not after first after second. · 5 months, 1 week ago

Yeah i meant first collision with rough ground · 5 months, 1 week ago

sorry i did not noticed the phrase "rough surface" . · 5 months, 1 week ago

no problem i just want your opinion on comparison in between two cases if i apply your explanation to our simple case of pure rolling on horizontal surface · 5 months, 1 week ago