Work Energy And Power Question 111

Question: 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 [AIIMS 2000]

Options:

A) 0.89

B) 0.56

C) 0.23

D) 0.18

Show Answer

Answer:

Correct Answer: A

Solution:

As 20% energy lost in collision therefore $ mgh_2=80%\ \text{of }mgh_1 $

therefore $ \frac{h_2}{h_1}=0.8 $

but $ e=\sqrt{\frac{h_2}{h_1}}=\sqrt{0.8}=0.89 $



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