Work Energy And Power Question 129
Question: A tennis ball dropped from a height of 2 m rebounds only 1.5 m after hitting the ground. What fraction of its energy is lost in the impact
Options:
A) $ \frac{1}{4} $
B) $ \frac{1}{2} $
C) $ \frac{1}{3} $
D) $ \frac{1}{8} $
Show Answer
Answer:
Correct Answer: A
Solution:
Fractional loss $ =\frac{\Delta U}{U}=\frac{mg(h-{h}’)}{mgh} $
$ =\frac{2-1.5}{2}=\frac{1}{4} $
