A block with mass of m1 = 2 kg is placed on top of a block with a mass m2 = 4 kg. A horizontal force of F=60 N is applied to the block m2, and the block m1 is tied to the wall. The coefficient of kinetic friction between all surfaces is 0.400. (a) Draw a free-body diagram for each block and identify the action–reaction forces between the blocks. (b) Determine the tension in the string and the magnitude of the acceleration of the block m2. ( g=9.8 m/s2 )

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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?”