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 and just after the collision.

Explanation

To solve the problem step by step, we will calculate the percentage loss in kinetic energy and the ratio of the velocities of the body just before and just after the collision.

### Given:
- Initial height (h1) = 10 m
- Rebound height (h2) = 2.5 m
- Acceleration due to gravity (g) = 9.81 m/s² (we can use 10 m/s² for simplicity)

### Step 1: Calculate the velocity just before the collision (u)
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