Answer to Question #158284 in Classical Mechanics for Mst. Asifa Khatun

Question

Let the force of gravity to be constant for small distances above the surface of the earth. A body is dropped from rest at a height h above the earth surface. What will be its kinetic energy just before it strikes the ground?

Answer 1

The law of conservation of energy says

$$mgh=\frac{mv^2}{2}$$

Hence,

$$v=\sqrt{2gh}$$