You push a file cabinet up a frictionless ramp tilted at 10with horizontal. The file cabinet has a mass of 100 kg and you are pushing with a 700 N force in the direction up along the ramp. The file cabinet has initial speed of 2.0 m/s. It's moved 8.0 m up along the ramp. What is the change in gravitational potential energy? (Hint: what is y?) -8000 J none of the given -7878 J 8000 J 1389 J -1389 J 7878 J