"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."
See attached file for full problem description.
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.