posted by maria .
a 600 n box is pushed up a ramp that is 2m high and 5 m long, the person is pushing the box at a force of 300 n,what is the efficiency of a ramp ?
This doesn't look like a 6th grade question to me.
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%