What is the final velocity of a body freely falling from a height of 20 m?

Problem data: h (height from which the free fall of the given body began) = 20 m.

Reference values: g (acceleration due to gravity) ≈ 10 m / s2.

We calculate the final speed of a given body using the law of conservation of energy: m * V ^ 2/2 = m * g * h, whence V = √ (2 * m * g * h / m) = √ (2 * g * h).

Let’s calculate: V = √ (2 * 10 * 20) = 20 m / s.

Answer: The final speed of the given body was 20 m / s.