Question

A student drops a rubber ball onto a surface. Assume that this is a closed system. The ball bounces, but each successive bounce is shorter than the one before it. Eventually, the ball comes to a stop. Which statement provides evidence that supports the idea that energy is conserved in this closed system?
A. The ball moves through air, suggesting that the ball has mechanical energy.

B. The ball needs a push or pull to start moving, suggesting it needs a constant input of energy.

C. The ball makes a sound with each bounce, suggesting that some kinetic energy transformed into sound.

D. The ball bounces many times, suggesting the energy is used up efficiently

Answer 1

Answer: D because it is correct

Answer 2

I would say D.) The ball bounces many times suggesting the energy is used up efficiently