Question

A ball is tossed up into the air and falls back down to the ground as it moves from point A to point E as seen in the picture below. When will the ball's potential energy be decreasing and its kinetic energy increasing?​

Answer 1

Energy = Potential Energy + Kinetic Energy

E = M g h + 1/2 M v^2

On the way up h (height) is increasing and the velocity v is decreasing.

Between C and E the given conditions hold