A 600N box is pushed up a ramp that is 2m high and 5m long. the person pushing the box exerts a force of 300N. what is the efficiency of the ramp.

The gain in potential energy is 600*2 = 1200 J, and this is the minimum required work that would be required in a frictionless situation. The work that actually has to be done is F*X = 300*5 = 1500 J. The efficiency is therefore 1200/1500 = 80%