The three boxes below have the following masses m1=1.1 kg, m2=7.4 kg, and m3=9.5 kg.  The surface is frictionless.  A force F=30.5 N is applied to the first box.  Determine the force of box 2 on box 3.

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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!