A body falling on the ground from a height of 10m, rebounds to a height 2.5 m Calculate
(i) The percentage loss in KE
(ii) Ratio of the velocities of the body just before nd just after the collision.

Explanation

To solve the problem step by step, we will first calculate the initial and final kinetic energies, then find the percentage loss in kinetic energy, and finally determine the ratio of the velocities before and after the collision.

### Step 1: Calculate the initial velocity just before hitting the ground

The body falls from a height of 10 m. The velocity \( V \) just before it hits the ground can be calculated using the formula:

\[
V = \sqrt{2gH}
...