The body falls from a height of 60 m how long the body falls and what is its speed when it hits the ground.

Initial data: H (height from which the body began to fall) = 60 m; V0 (initial velocity of the body, free fall) = 0 m / s.

Constants: a (body acceleration) = g (gravitational acceleration) = 10 m / s ^ 2.

1) Determine the speed of the body when hitting the ground: S = H = (V ^ 2 – V0 ^ 2) / 2a = V ^ 2 / 2g, whence V = √ (2 * g * S) = √ (2 * 10 * 60) = √1200 = 34.64 m / s.

2) Let’s calculate the time of the body falling:

a) V = g * t and t = V / g = 34.64 / 10 ≈ 3.5 s.

b) H = g * t ^ 2/2 and t = √ (2H / g) = √ (2 * 60/10) ≈ 3.5 s.