Two boxes are placed on a horizontal frictionless surface, as shown above. Box A has a mass of 10 kg and box B has a mass of 16 kg. A force of 54 N is pushing box A. (a) Draw a free-body diagram for each block showing all applied forces to scale. Next to each diagram show the direction of the acceleration of that object. (b) Find the acceleration of the system of two boxes. (c) Find the force of contact that each box exerts on its neighbor.

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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!