A 110.0 kg box is pushed by a horizontal force F at constant speed up a frictionless ramp which makes an angle of 35.0 deg with the horizontal. Find the magnitude of the applied force F.

Answer 1

(component of the force in the direction of motion)*(distance moved, L) = Work = (Increase in potential energy)

F*cos35*L = M*g*L*sin 35

F = M g tan35 = 755 N

Answer 2

A man pushes on a piano with mass 150 so that it slides at constant velocity down a ramp that is inclined at 14.7 above the horizontal floor. Neglect any friction acting on the piano.