Active Past
Freefall: graphs and conceptual questions
Violet throws a ball down from a bridge and it strikes the water below. We can ignore air resistance.
What is true about the acceleration and speed of the ball on its way down?
Assume that upward is the positive direction.

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.