force of 22 N is pulling two carts to the right on a frictionless surface. If both carts have the same mass, what is the tension, T, in the string connecting m1 and m2. See figure below.

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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?”