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A body falling from a height of 10m rebo...

A body falling from a height of 10m rebounds from hard floor. If it loses 20% energy in the impact, then coefficient of restitution is

A

0.89

B

0.56

C

0.23

D

0.18

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Verified by Experts

The correct Answer is:
A
As 20% energy lost in collision therefore
`mgh_(2)= 80%` of `mgh_(1) rArr (h_(2))/(h_(1))= 0.8`
but `e= sqrt((h_(2))/(h_(1))) =sqrt0.8= 0.89`
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