A 20-kg box is pushed up a curved frictionless slope as represented in the diagram. If the height of the curve is 5.0 m and the horizontal distance over which the box is pushed is 8.0 m, what is the work done on the box by the pusher? You can treat the box as a point particle. Assume that the cart arrives at the top of the curve with the same speed it had at the bottom. X 5 m 8 m Not enough information to determine. O 980 J O 1570 J O 1850 J O -1850 J