A ball of mass 20 g falls from a height of 10 m and after striking the ground.It rebounds from the ground to a height of 8 m .
(a) Calculate:
(i)The kinetic energy of the ball just before striking the ground ,and
(ii)The loss in kinetic energy of the ball on striking the ground,and
(ii)the loss in kinetic energy of the ball on striking the ground.
(b)What happens to the loss in kinetic energy in part(ii) ?
Take g=10 m `s^(-2)` Neglect air friction .

Explanation

To solve the problem step by step, we will calculate the kinetic energy of the ball just before it strikes the ground, the loss in kinetic energy upon striking the ground, and discuss what happens to the lost energy.

### Step 1: Calculate the potential energy at the height of 10 m

The potential energy (PE) of the ball at a height \( h \) is given by the formula:
\[ PE = m \cdot g \cdot h \]
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