1. The problem statement, all variables and given/known data 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 2. Relevant equations Well I know since it's kept from accelerating, the sum of all forces of work is 0. 3. The attempt at a solution I honestly don't know where to start.