the diagram below shows a roller coaster on a frictionless track. at position 1 it is at 100 meters, at 2 it is at 9, at 3 it's at 80, and at 4 it's 40 meters. at point one, it has 10 bars of potential energy and 0 kinetic energy. at what point of the track would it have 6 bars of potential energy and 4 bars on kinetic energy?​