Projectile practice

You have a cannon a distance dd before the start of a hill. The hill goes up at an angle θ\theta from the ground. What angle and velocity must you shoot a cannon ball so that it lands a distance ss up the hill?(The distance s is measured from the bottom of the hill, i.e. the distance along the hill).

Note by Nihar Mahajan
4 years ago

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I think there are infinite solutions to this problem. There are infinite parabolas passing through (0,0) and (d+sCosθ,sSinθ)(d+sCos\theta,sSin\theta), the cannon at (0,0).

Niranjan Khanderia - 4 years ago

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Well, I believe that the gravitational field is fixed, so you may assume that acceleration is aa....

Calvin Lin Staff - 4 years ago

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Niranjan sir is right since angle and velocity both are upto us there are infinite possibilities.One of them has to be given for a finite(2 if velocity is given[not always]) number of solutions.

Krishna Sharma - 4 years ago

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@Krishna Sharma Oh yes that's true. For some reason, I though the angle of the cannon was fixed (when it's just the angle of the hill that is fixed).

So, what is the relationship between θ \theta and v v ?

Calvin Lin Staff - 4 years ago

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I got v=(d+scosθ)g2(sin2α)(d+scosθ)ssinθcos2α\large v= (d+s\cos\theta)\sqrt{\dfrac{g}{2(\sin 2\alpha)(d+s\cos\theta) - s\sin\theta\cos^2\alpha}} where vv and α\alpha is the required velocity and angle. As you say , there are infinitely many solutions. Is this correct?

This question is given to me by @Josh Silverman Sir.

Nihar Mahajan - 4 years ago

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The above equation has two unknowns. Only one equation. Thus infinity solutions.

Niranjan Khanderia - 4 years ago

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@Niranjan Khanderia Yes , that was what I was saying too.

Nihar Mahajan - 4 years ago

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Hey guys, I've made this into a well-constrained problem, here

Josh Silverman Staff - 4 years ago

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