The problem statement, all variables and given/known data A sled is going down a slope of 40m, which has an angle of 30 degrees with the horizontal. The total mass of the sled is 40kg. There is a constant frictional force of 40 N holding back the movement of the sled. The sled has an initial velocity of 3m.s-1. What is the net force experienced by the sled parallel to the angle? What is the maximum speed reached by the sled at the bottom of the slope? 3. The attempt at a solution The part about frictional force in confusing the heck out of me, so I don't know where to start. Do I simply add Ek((1/2)(40)((3)^2)) +Ep((40)(9.8)(sin30(40)) - (40x40)?