Aball is thrown in the air. the ball goes up, then changes direction and falls down. why does the ball fall down? gravity pushes the earth up. gravity makes the ball lighter. gravity stops working. gravity pulls it down.

So the acceleration has actually slowed down the ball because it was going in the direction opposite the velocity. Now see what happens as the ball falls back down to Earth. The ball has zero velocity, but the acceleration due to gravity accelerates the ball downward at a rate of –9.8 m/s2.

hope it helps