A 5.0-kg block and a 4.0-kg block are connected by a 0.6 kg rod,as shown in the figure.The links between the blocks and the rod are denoted by A and B.A vertical upward force of magnitude F is exerted on the upper block.The blocks and rod assembly are moving downward at constant velocity of 85 cm/s. (a)What is the magnitude of the applied force F?
(b)What magnitude force does link A exert? 
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