Question

A boy on a roof throws one ball downward and an identical ball upward. The ball thrown downward hits the ground with 100 J of kinetic energy. If both balls are thrown at the same speed and there is no air friction, what is the kinetic energy of the second just before it hits the ground

Answer 1

The kinetic energy of the second ball just before it hits the ground is 100 J.

Step-by-step explanation:

The kinetic energy of the second ball just before it hits the ground can be determined by understanding the conservation of energy. Since both balls are thrown at the same speed and there is no air friction, the kinetic energy of the second ball just before it hits the ground would be the same as the first ball, which is 100 J.