19. A 1000-kg roller-coaster car moves from point 1, Fig.,…
19. A 1000-kg roller-coaster car moves from point 1, Fig., to point 2 and then to point 3. (a) What is the gravitational potential energy at points 2 and 3 relative to point 1? That is, take y=0 at point 1. (b) What is the change in potential energy when the car goes from point 2 to point 3? (c) Repeat parts (a) and (b), but take the reference point (y=0) to be at point 3.