You are testing a new amusement park roller coaster with an empty car with a mass of
One part of the track is a vertical loop with a radius of
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
You may want to review (Pages 203 - 212).
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As the car rolls from point A to point B, how much work is done by friction?