Hey student bounces a tennis ball. She drops the ball then it bounces back up super when does the ball have zero kinetic energy?

Answer 1

The ball has zero kinetic energy at the highest point of its bounce, just before it begins to fall back down. Kinetic energy is the energy of motion, so when the ball is at rest at the peak of its bounce (momentarily stationary), its velocity is zero, and consequently, its kinetic energy is also zero. However, at that point, it has maximum potential energy due to its height above the ground.