Answer to Question #145515 in Physics for Alena Aranda

Question

A rock of mass m is thrown horizontally off a building from a height h. The speed of the rock as it leaves the throwers hand at the edge of the building is v0 as shown. What is the kinetic energy of the rock just before it hits the ground

Answer 1

From the conservation of energy:

$$K_f=K_i+U\\K_f=\frac{1}{2}mv_0^2+mgh$$