Two boxes are connected by a cord running over a pulley as shown in the figure. Box I of mass 8.0 kg rest on the top of the table; the coefficient of kinetic friction between box I and the table is 0.10. Box II has a mass of 15.0 kg.  a) Draw the free-body diagrams for the two boxes, identifying all of the forces acting on each of the masses. b) Calculate the acceleration of the system. c) Calculate the tension in the cord.

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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!