A roller-coaster car of mass 1.80 103 kg is initially at the top of a rise at point circle a. It then moves 40.8 m at an angle of 50.0° below the horizontal to a lower point circle b.
(a) Find both the potential energy of the system when the car is at points circle a and circle b and the change in potential energy as the car moves from point circle a to point circle b, assuming y = 0 at point circle b.
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