A
370 kg piano slides 2.5 m down a 28° incline and is kept from
accelerating by a man who is pushing back on it parallel to the
incline. Determine: (a) the force exerted by the man (b) The work
done on the piano by the man, (c) the work done on the piano by the
force of gravity and (d) the net work done on the piano. Ignore
friction.