From what height should the body be thrown so that it falls to the ground at a speed of 30 m / s?

These tasks: V (the speed that the body must have before hitting the ground) = 30 m / s; the fall of the body will be considered free (V0 = 0 m / s).

Reference data: g (acceleration of gravity; acceleration with which the body fell) ≈ 10 m / s2.

The height from which it is necessary to throw the body is determined by the formula: S = H = (V ^ 2 – V0 ^ 2) / 2a = V ^ 2 / 2g.

Calculation: H = 30 ^ 2 / (2 * 10) = 900/20 = 45 m.

Answer: The body must be thrown from a height of 45 meters.