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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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a
0.89
b
0.56
c
0.23
d
0.18

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detailed solution

Correct option is A

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

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