A ball of mass 50 g falls from rest vertically downwards through a distance of 40 m and hits the ground. Find the kinetic energy and final velocity of the ball before it hits the ground `(g=9.8 ms^(-2))`.

Explanation

To solve the problem, we will follow these steps:

### Step 1: Convert mass from grams to kilograms
The mass of the ball is given as 50 grams. We need to convert this to kilograms since the SI unit of mass is kilograms.

\[ \text{Mass (m)} = 50 \, \text{g} = 50 \times 10^{-3} \, \text{kg} = 0.050 \, \text{kg} \]
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