15. a girl pushes a box that has a mass of 85 kg up an incline. if the giri exerts a force
of 200 n along the incline what is the mechanical advantage of the incline?

M.A = 4.25

Mechanical advantage is the ratio of the force required to do something in comparison to the actual force required using a simple machine.

It is the ratio of output force to the input force.

M.A = Output Force/ Input Force

Out put force 85 Kg = 850 N

Input force = 200 N

Therefore;

M.A = 850 N/200 N

        = 4.25

answer: point c: b. 1/2 potential, 1/2 kinetic, point a: 3/4 of its potential energy, point d or b: 3/4 potential, 1/4 kinetic

explanation: i cant explain. it's difficult to explain.