Q 11-05-110JEE MainJEE Main 2023 (6 Apr, Shift 2)Easy
A body is dropped on ground from a height $h_1$ and after hitting the ground, it rebounds to a height $h_2$. If the ratio of velocities of the body just before and after hitting ground is $4$, then percentage loss in kinetic energy of the body is $\dfrac x4$. The value of $x$ is ______.
Numerical value type. Enter your answer.
Answer: 375
$K\propto v^2$: after the bounce $K=\dfrac{1}{16}K_0$, so the loss is $\dfrac{15}{16}=93.75\%=\dfrac{375}{4}\%$.
Solution by Sreeraj P, M.Sc Physics