1. The problem statement, all variables and given/known data A 260 kg piano slides 4.3 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (Fig. 6-36). The effective coefficient of kinetic friction is 0.40. Figure 6-36 (a) Calculate the force exerted by the man. 391.3469084 N (b) Calculate the work done by the man on the piano. -1682.791706 J (c) Calculate the work done by the friction force. -3795.408294 J (d) What is the work done by the force of gravity? ? J (e) What is the net work done on the piano? ? J 2. Relevant equations Work=Force*Distance gravity=9.8 Fnet=Sum of all forces 3. The attempt at a solution Letters a through c are correct, but I have not been able to solve for d and e. I have tried doing W=FX for letter d, but with no luck. I cannot solve for e without solving for d. Any help is appreciated. Thank you!