1. The problem statement, all variables and given/known data A 38kg block is on a slope that is 50 degrees above the horizon. The box is attached to a 9kg weight that rests on a flat surface (connected to the top of the slope). The coefficient of friction for both surfaces is 0.12. Calculate the acceleration of the system. 2. Relevant equations Fnet = Fapp - Ff Fgx = (sin[angle])(gravity)(mass) F = ma 3. The attempt at a solution Fnet = Fapp - Ff Fnet = (38 * 9.81 * (sin50)) - (9*9.81*.12) - ((Cos50)*9.81*38*0.12) Fnet = 246.1 F = ma a = f/m a = 246.21/(38+9) a = 5.24m/s^2 My professor got 2.9m/s^2 and I can't see where (if) I'm going wrong. Help would be absolutely fantastic. Thanks!