Three boxes, each of mass 13 kg are on a frictionless table, connected by massless strings. A force of tension T1 pulls on the right most box (A) such that the three boxes accelerate in the positive horizontal direction at a rate of a = 0.7 m/s2. What is the magnitude of T1? What is the net horizontal force on box A ?

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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?”