1. The problem statement, all variables and given/known data A 1000 kg roller coaser train is intially at the top of a rise, at point A. It then moves 135 ft, at an angle of 40 degrees below the horizontal, to a lower point B. Choose the train at point B to be the zero configuration for gravitational potential energy. Find the potential energy of the roller coaster-Earth system at points A and B, and the change in potential energy as the coaster moves. 2. Relevant equations Ug=mgy 3. The attempt at a solution Y at Point A=86.8 m Ug= 850640 Kj This isn't the right answer, so where am I going wrong?