Joe is dragging a bag of garbage to the street on the evening before garbage pick-up day. The mass of the garbage bag is 20 kg. The force of friction encountered by the garbage bag, as it moves across the street, is 10 N. Joe applies a force of 50 N on the bag. a. Draw the free-body diagram to illustrate the forces acting on the garbage bag. b. What is the net force acting on the bag? c. What is the acceleration of the garbage bag?