What is the speed of a freely falling body at the end of a fall from a height of 20m?

The final speed (V) can be derived from the formula:
h = (V ^ 2-Vo ^ 2) / 2a
Because Vo is 0, it can be removed from this formula
h = V ^ 2 / 2a
h * 2a = V ^ 2
V = √h * 2a
The acceleration of a free falling body = 10 m / s ^ 2, and it remains only to substitute the values
V = √20 * 20
V = √400
V = 20 (m / s)
Answer: V = 20 (m / s)