Answered: A metal ball is placed in a device with a spring that has been compressed past it’s equilibrium point so that when the spring is released, it will propel the ball into the air. The device is set up on a table one meter above the floor. Which components make up the initial energy of the system? A. Gravitational potential energy only.

B. Kinetic energy, spring potential energy, and gravitational potential energy.

C. ANSWER: Spring potential energy and gravitational potential energy.

D. Spring potential energy and kinetic energy.

Explanation: there is no initial motion, so there is no kinetic energy.