A ball falls onto a horizontal surface and rebounds elastically. What occurs to the ball’s kinetic energy over the very brief interval while it is touching the surface?
- AMost of the kinetic energy is lost as heat and sound energy.
- BThe kinetic energy decreases to zero and then returns to its original value.
- CThe kinetic energy remains constant because it is an elastic collision.
- DThe kinetic energy remains constant in magnitude but changes direction.