A roller coaster (305 kg) moves from A (5.00 m above the ground) to B (23.0 m above the ground)Two nonconservative forces are present: friction does -2.00 104 J of work on the car, and a chain mechanism does +3.00 104 J of work to help the car up a long climb. What is the change in the car's kinetic energy, ΔKE = KEf - KE0, from A to B?