Question

An object is held in the hand at a height of 2.5 m above the ground and released

a) how long will it take to reach the ground

b) with what velocity will it hit the ground?

Answer 1

a) The time is

$$t=\sqrt{2h/g}=0.71\text{ s}.$$

b) The velocity is

$$v=\sqrt{2gh}=7\text{ m/s}.$$