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A small block with mass 0.0475 kg slides in a vertical circle of radius 0.450 m...

A small block with mass 0.0475 kg slides in a vertical circle of radius 0.450 m on the inside of a circular track. During one of the revolutions of the block, when the block is at the bottom of its path, point A , the magnitude of the normal force exerted on the block by the track has magnitude 3.75 N . In this same revolution, when the block reaches the top of its path, point B , the magnitude of the normal force exerted on the block has magnitude 0.670 N .

How much work was done on the block by friction during the motion of the block from point A to point B?

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