Two boxes, A and B, are connected to each end of a light vertical rope, as shown in the following figure. A constant upward force 84.0 N is applied to box A. Starting from rest, box B descends 13.0 m in 4.70 s . The tension in the rope connecting the two boxes is 30.0 N (Figure 1). I) What is the mass of box B? (Express your answer with the appropriate units.) II) What is the mass of box A? (Express your answer with the appropriate units.)

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!