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

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Answer 1 · 2018-03-04T12:28:23

$0.2$

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, $e=v/u =20/100=0.2$