Two boxes of fruit on a frictionless horizontal surface are connected by a light string as in Figure P4.65, where m1 = 10 kg and m2 = 20 kg. A force of 50 N is applied to the 20-kg box.(a) Determine the acceleration of each box and the tension in the string.(b) Repeat the problem for the case where the coefficient of kinetic friction between each box and the surface is 0.10.

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”