Question: A roller coaster ( 4 1 7 kg ) moves from A ( 3 . 2 0 m above the ground ) to B (

A roller coaster (417 kg) moves from A (3.20 m above the ground) to B (21.7 m above the ground). Two non-conservative forces are present: friction does -2.87 x 104J of work on the car, and a chain mechanism does +5.0210* J of work to help the car up a long climb. What is the change in the car's kinetic energy KE,- KE, from A to B?

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