I have a problem I'm trying to figure out. To see the problem and picture, please go to problem #10 at this site: http://www.compadre.org/psrc/evals/IPO_2003_Multiple_Choice.pdf. The problem says, A roller coaster car moves along a track as shown. At point A, the car is moving with a speed of 10 m/s. If friction is negligible, about how fast would the car be moving at point B? If you don't have PDF, I'll try to explain the scenario: The car is at Point A, which is 50 m above the ground. It is traveling at 10 m/s. Then the rollercoaster curves downwards to an un-named point which is 10 m above the ground. From that point, it curves upwards to point B which is 30 m above the ground.