6. The two blocks in the figure have masses mA and mB and are connected by a heavy uniform rope with a mass mR. An upward force F is applied as shown. (a) Draw three free-body diagrams: one for the block A, one for the rope, and another one for block B. For each force, indicate what body exerts that force. (b) Identify which forces that appear in your diagrams form third law pairs. (c) What is the acceleration of the system? (d) What is the tension at the top of the heavy rope? (e) What is the tension at the midpoint of the rope?