Question

as a roller coaster goes downhill
a kinetic energy is converted into potential energy
b potential energy is converted into kinetic energy.
c electrical energy is converted into potential energy
d potential energy is converted into electrical energy

Explanation:

Potential energy depends on height and mass. As the roller - coaster goes downhill, its height decreases and speed increases. According to the law of conservation of energy, the potential energy is converted into kinetic energy.

Answer:

B. potential energy is converted into kinetic energy