Imagine the same wooden model train car is traveling at 0.25 m/s and hits another model train car that is at rest. Their magnets allow them to couple and keep moving. If both cars have a mass of 0.20 kg, what is their new speed?

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.