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You are testing a new amusement park roller coaster with an empty car with a mass...

You are testing a new amusement park roller coaster with an empty car with a mass of 120 kg . One part of the track is a vertical loop with a radius of 12.0 m . At the bottom of the loop (point A) the car has a speed of 25.0 m/s and at the top of the loop (point B) it has speed of 8.00 m/s .

As the car rolls from point A to point B, how much work is done by friction?

Use 9.81 m/s2 for the acceleration due to gravity.
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Answer #1

Use work energy theorem where work done by friction and gravity is equal to change in kinetic energy of the rollercoaster.

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