n the figure below, if the tension in string 1 is 34 N and the tension in string 2 is 24 N, what is the mass of the object shown? (The answer is 3.7, but I want to know how to find it.)

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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?”