Question

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Answer 1

Solution:

Let the initial velocity of bass when projected is u

then componentnt of velocity in x direction = u cos x [x is the angle of projection]

NOW, it is given that ball collide perpendicular to wall. it means ball is at his maximum height.

we know that, at maximum height only x component of velocity work.

Thus, at a time of collison the velocity of ball is  u cosx .

Here, it is also given that, ball has come bas to orignal position .

thus, velocity of ball after collision is also same , which is u cosx

Now,cofficient of restitution = u cos x / u cos x

=> k/4 = u cosx/ u cosx

=> k = 4

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Amrit