A ball is dropped from height 5m . time after which ball stops rebounding if coefficient of restitut

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5.Work, Energy, Power and Collision

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$A$ ball is dropped from height $5m$. The time after which ball stops rebounding if coefficient of restitution between ball and ground $e = 1/2$, is .................. $\mathrm{sec}$

A

$1$

B

$2$

C

$3 $

D

infinite

Solution

$t=\frac{u}{g} \propto e \Rightarrow t \sqrt{\frac{2 h}{g}}\left[1+2\left(e+e^{2}+e^{3}+\ldots \infty\right)\right]=3 s$

Standard 11

Physics

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