A ball of mass 50 is thrown vertically upwards
with an initial velocity of 20 `ms^(1)` Calculate: (i) in the initial kinetic energy imparted to the ball,
(ii) the maximum height reached if air friction is neglected, and
(iii) the maximum height reached if 40% of the initial energy is lost against the air friction.
Take g=10 `ms^(-2)`

Explanation

To solve the problem step by step, we will calculate the initial kinetic energy, the maximum height reached without air friction, and the maximum height reached with air friction.

### Step 1: Calculate the Initial Kinetic Energy

The formula for kinetic energy (KE) is given by:

\[
KE = \frac{1}{2} m v^2
...