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A 380 kg piano slides 3.9m down a 27 degree incline and is kept from accelerating by a man who is pushing back on it parallel to the incline.

A 380 kg piano slides 3.9m down a 27 degree incline and is kept from accelerating by a man who is pushing back on it parallel to the incline.
a) Determine the force exerted by the man
b) Determine the work done by the man on the piano

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