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Question: a roller coaster 390 kg moves from a 496 m...

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A roller coaster (390 kg) moves from A (4.96 m above the ground) to B (20.9 m above the ground). Two non-conservative forces are present: friction does -1.86 x 104 J of work on the car, and a chain mechanism does +5.66 x 104 J of work to help the car up a long climb. What is the change in the car's kinetic energy KEf - KEo from A to B?

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