Question

which energy change best relates to a boulder that is rolling down the side of a hill?
potential energy transforming into kinetic energy
mechanical energy transforming into thermal energy
potential energy transforming into electromagnetic energy
mechanical energy transforming into electromagnetic energy

Explanation:

A boulder at the top of a hill has gravitational - potential energy due to its height. As it rolls down, its height decreases and speed increases, so potential energy is converted to kinetic energy.

Answer:

A. potential energy transforming into kinetic energy