A roller coaster (375kg) moves from A (5.00m above the ground) to B (20.0m above the ground). Two nonconservative forces are present: friction does -2.00e4J of work on the car, and a chain mechanism does 3.00e4J of work to help the car up a long climb. What is the change in the car’s kinetic energy, DeltaKE=KEf – KEo, from A to B?
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