With what speed will a body thrown vertically down from a height of 8 meters

With what speed will a body thrown vertically down from a height of 8 meters and a speed of 4 m / s fall to the ground?

h = 8 m.

V0 = 4 m / s.

g = 9.8 m / s2.

V -?

Let us express the height of the stone throw h by the formula: h = (V² – V0²) / 2 * g.

V² – V0² = 2 * g * h.

V² = V0² + 2 * g * h.

V = √ (V0² + 2 * g * h).

V = √ ((4 m / s) 2 + 2 * 9.8 m / s2 * 8 m) = 13 m / s.

Answer: at the moment of impact on the ground, the body has a speed of V = 13 m / s.