A demonstration helps students understand a principle of roller coaster design. Which answer choice correctly describes the ball’s kinetic and potential energy?

A. The ball has more potential energy at position X than at position Z.

B. The ball has more kinetic energy at position Y than at position W.

C. The potential energy and kinetic energy of the ball are equal at position X.

D. The potential energy and kinetic energy of the ball are greatest at position Z.