"A 276 kg piano slides 4.02 m down a 30.2° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline, as seen in the figure (attached in a Word file). The effective coefficient of kinetic friction is 0.400. Calculate the work done by the man on the piano."
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The force of gravity on the piano = 276 kg * 9.8 m/s^2 = 2,705 N.
This can be broken down into a component ...
This solution looks at the work done by a man on a piano moving down an incline.