Solving a Ramp Problem: Calculating Forces and Work Done on a Sliding Piano

[YuppittTales]

Homework Statement

A 280kg piano slides 4.3 meters down a 30 degree incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is .40. Calculate: a) The force exerted by the man. b) The work done by the man on the piano. c) the work done by the friction force. d) The work done by the force of gravity. e) The net work done on the piano

Homework Equations

Well I know since it's kept from accelerating, the sum of all forces of work is 0.

The Attempt at a Solution

I honestly don't know where to start.

 

[zachzach]

Draw the forces on the piano. You know what they all sum to.