A 1 kg object rests at the top of a quarter pipe, Ask an Expert

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A 1 kg object rests at the top of a quarter pipe cylindrical ramp of radius 1 m. The object is released and slides down the ramp. When the object reaches the bottom of the ramp, the frictional force on it has been enough to just bring the object to a stop. What work was done on the object by this frictional force?

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