When is thermal equilibrium achieved between two objects?

a. when the particles in one object have more kinetic energy

b. when one objects is hotter than the other

c. when both objects have the same temperature

Complete these sentences. if a roller coaster train has a potential energy of 1,500 j and a kinetic energy of 500 j as it starts to travel downhill, its total energy isj. once the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 j, and its potential energy decreases to j. when the train reaches the bottom of the track and is traveling along the ground, its kinetic energy isj.