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

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0.89

0.56

0.23

0.18

answer is A.

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Detailed Solution

As 20% energy lost in collision thereforemgh2=80% of mgh1 ⇒h2h1=0.8but e=h2h1=0.8=0.89

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