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Physics doubt!

How to solve this? I understand that we need to use force as vdm/dt but the answer doesn't match?

Note by A E
5 months, 4 weeks ago

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The best part is I could perform this at home after solving.just take a slinky tie its end and make a curl and move it.you will get it. Spandan Senapati · 5 months, 4 weeks ago

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@Spandan Senapati bas bi kar pura lecture lagaega kya ? :P Brilliant Member · 5 months, 4 weeks ago

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@Brilliant Member Don't mind your handwriting isn't good.although legible Spandan Senapati · 5 months, 4 weeks ago

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@Spandan Senapati achha thik hai. :( Brilliant Member · 5 months, 4 weeks ago

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@Brilliant Member Ab handwriting pe fight mat karo bhaiyon... A E · 5 months, 4 weeks ago

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@A E maine to kuch kaha hi ni ! , koi aur question de na yaar :) Brilliant Member · 5 months, 4 weeks ago

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@Brilliant Member Ruk kaal Deta hoon a hi mai abhi sone jaa raha hoon !!!! A E · 5 months, 4 weeks ago

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@A E kai saarre laio , waisse toh mujhe module bhi shuru kar ne hai , phir bhi :) Brilliant Member · 5 months, 4 weeks ago

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@Brilliant Member Yaa.... sure A E · 5 months, 4 weeks ago

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@A E l'm the only one from my center not to even start doing my coaching modules while others have finished it :\ Brilliant Member · 5 months, 4 weeks ago

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@Brilliant Member Modules se accha hai kuch achhe books karna ,uske bad modules relatively easy lagenge.... A E · 5 months, 4 weeks ago

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@A E abe time kaha hai ? ab to cbse aur 2 ko mains :! Brilliant Member · 5 months, 4 weeks ago

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@Brilliant Member Bas Chem hi bacha hoga na ? A E · 5 months, 4 weeks ago

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@A E sare subject , mera bura haal hai :: Brilliant Member · 5 months, 4 weeks ago

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@Brilliant Member OK then all the best.....be positive mains accha hoga aur adv bhi A E · 5 months, 4 weeks ago

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@A E thnx bhai , as long as bhais like you r around me no mains-advance can stop me :) (hopefully:P) Brilliant Member · 5 months, 4 weeks ago

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@Brilliant Member Yes ....study hard you will rock both the exams. Good night. A E · 5 months, 4 weeks ago

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@A E yep gd........tc :D Brilliant Member · 5 months, 4 weeks ago

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@Spandan Senapati ok ....thanks for help!!! A E · 5 months, 4 weeks ago

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Oye @A E Brilliant Member · 5 months, 4 weeks ago

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@Brilliant Member kidhar hai bhai ? Brilliant Member · 5 months, 4 weeks ago

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@Brilliant Member Ghar pe. A E · 5 months, 4 weeks ago

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@A E mera net slow hai :P pehle likha tha Brilliant Member · 5 months, 4 weeks ago

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@Brilliant Member yeh question INPHO 2009 ka tha . A E · 5 months, 4 weeks ago

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@A E Ya I got kv^2/2.it will be misleading for many I guess to mark kv^2.but if the part held goes a distance of vt then the part coming to motion will have a length of vt/2.its quite apparent and easy to analyse if the part held goes vt then the part that will be available to come to motion must be vt as length is conserved but this appears in the curl with 2 half length of (vt/2)each!!!so now we can use f=vdm/dt =vd(kvt/2)/dt=kv^2/2. Spandan Senapati · 5 months, 4 weeks ago

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@Spandan Senapati yaa ......great observation. A E · 5 months, 4 weeks ago

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@A E And only one part of the curl will be in motion as the other will be with the ground itself.(so rest)☺☺ Spandan Senapati · 5 months, 4 weeks ago

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@A E oh ! samaj aa gya ke ? Brilliant Member · 5 months, 4 weeks ago

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@Brilliant Member haan aa gya.....itna physics kaise aata hai bhai????? A E · 5 months, 4 weeks ago

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@A E are mein to kuch bi nhi hue yaar , bhai hoga to yeh Q dubara mat poocheyo plz , meri padai ke mamle mein bezzati kr liya kr besak :) P.S i hardly studied today :P Brilliant Member · 5 months, 4 weeks ago

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@Brilliant Member yeh 2nd solution mein 1/2 mv^2 ko kisse equate kiya hai....dikhai nahi de raha ? A E · 5 months, 4 weeks ago

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@A E F*l ( force *length ) Brilliant Member · 5 months, 4 weeks ago

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@Brilliant Member achha thik hai.. A E · 5 months, 4 weeks ago

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@Brilliant Member online whole day :( Brilliant Member · 5 months, 4 weeks ago

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@Brilliant Member Yes....reading the solution A E · 5 months, 4 weeks ago

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shit ! i wrote it on paper and clicked pic to show you , displaced the power cord a little and boom , computer off. after then solved 4 level 5's and wrote their solution , upvote them too :P le dekh le

samaj aa gya ?

samaj aa gya ?

Brilliant Member · 5 months, 4 weeks ago

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How to solve this? : momentum change= force :) Brilliant Member · 5 months, 4 weeks ago

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@Brilliant Member But using this answer comes as hv^2 A E · 5 months, 4 weeks ago

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@A E which one is given as answer ? Brilliant Member · 5 months, 4 weeks ago

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@Brilliant Member hv^2/2 A E · 5 months, 4 weeks ago

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ha! did it a long time ago ! :P Brilliant Member · 5 months, 4 weeks ago

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@Brilliant Member I told you ....you are awesome in physics A E · 5 months, 4 weeks ago

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@Spandan Senapati @shubham dhull. @Swapnil Das A E · 5 months, 4 weeks ago

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@A E Hey, that was a nice question! Swapnil Das · 5 months, 3 weeks ago

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@Swapnil Das Thanks.....try previous years inpho papers they are awesome. A E · 5 months, 3 weeks ago

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@A E Yup, they are. Swapnil Das · 5 months, 3 weeks ago

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