Question

A ball moving with velocity 20 m/s hit a wall vertically and followed the same path.If in this process its velocity becomes 20% of the previous value,find the coefficient of restitution?? Assume no effect of gravity on this horizontal motion

Answer 1

`0.2`

Explanation:

Coefficient of restitution `e` is defined as the ratio of relative velocity after the collision to relative velocity before the collision.

Here, if the velocity of the ball before the collision was `u` and after the collision became `v` then we can say,

`e=v/u` as the wall didn't move before or after the collsion

Given, `v=u*(20/100)`

so,`e=v/u =20/100=0.2`