A body falling without initial velocity reached the surface of the earth in 5 seconds. from what height did it fall?

To find the height from which the free fall of the body should have begun, we use the formula: S = h = a * t ^ 2/2 = g * t ^ 2/2.

Variables and constants: g – gravitational acceleration (g ≈ 10 m / s2); t – duration of free fall (t = 5 s).

Calculation: h = g * t ^ 2/2 = 10 * 5 ^ 2/2 = 125 m.

Answer: The free fall of the fallen body should have started from a height of 125 m.