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 $
