1. The problem statement, all variables and given/known data I have a test on this tomorrow .. please help.. A box, initially at rest, is pushed up a ramp by a constant force acting 20 degrees above the ramp’s surface (pushing into the ramp from behind the box). The magnitude of the force is 50.0 N. The coefficient of friction is 0.30. The box has a mass of 5.0 kg and the ramp has an angle of 25 degrees. (a)Find the force of friction. (b)Find the net force. (c)Find the acceleration. (d)Find the final speed of the box after 6.0 s. Find how far up the ramp the box will travel in 6.0 s. 2. Relevant equations 2 different angles th1 and th2 Ff = ?, Fnet = ? Calc Fn first then from Ff = (Mu)Fn, calc Ff, that would be (a) Sum of Fx would be (b) Using Sum of Fx = m. a we can get acc using d = 1/2 a t ^ 2 (because vi = 0) we get d at 6 sec using vf^2 = vi^2 + 2ad we can get vf But I am not getting the correct value of Ff 3. The attempt at a solution Sum of Fx = Fpx - Ff - Fgx = ma Sum of Fy = Fn - Fpy - Fgy = 0 Fn = 50sin20 + 5 cos20 = 17.10 Ff = (0.3) Fn = 6.54 but the correct ans is 18 N and so everything else is going wrong.. pleaase help.