Question

A ball is dropped off a 20.5 meter rooftop. What will the velocity of the ball just before it hits the ground?

Answer 1

6.40 m/s

Step-by-step explanation:

Here we have to consider the conservation of energy

Potential energy of a object = Kinetic Energy

Mgh = 1/2 M (v)2

V = root 2gh

V = root 2*10*20.5

V = 6.40 m/s