A 255 kilogram piano slides 4.2 meter down a 30 degrtee incline and is kept from accelerating by a person who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.40.
(a) Determine the force exerted by the person.
(b) Determine the work done by the man on the piano.
(c) Determine the work done by the friction force.
(d) Determine the work done by the force of gravity?
(e) Determine the net work done on the piano?