Question

A ball is dropped from a height `20 m` above the ground and it rebounds with coefficient of restitution `0.5` The total time (in second) of motion of ball till it stops completely.

Answer 1

Correct Answer - 6
`T = sqrt((2h)/(g)) ((1 + e)/(1 - e))`
`T = sqrt((2 xx 20)/(10)) ((1 + 0.5)/(1 - 0.5)) rArr T = 2 ((1.5)/(0.5))`
`rArr T = 6` sec