3.-(10 Points) You are loading boxes into a truck and you need a clever way to load your boxes. You then come up with the idea of using a long

ramp. One of the boxes is a20 kg box ready to be loaded at the bottom of a 15.0-m-long ramp that is inclined at 34°above the horizontal. A constant horizontal force of 290 N is applied to the box to push it up the ramp. While the box is moving, the ramp exerts a constant frictional force on it that has magnitude 65.0 N. (a) What is the total work done on the box during its motion from the bottom to the top of the ramp? (b) How much time does it take the box to travel to the top of the ramp?