Two masses connected by a light rope are pulled across a frictionless horizontal surface by a force of magnitude F, as shown in figure A. The tension in the light rope connecting the masses is: 1. Less than F 2. equal to F 3. 1000 N 4. Greater than F 5. 1500 N

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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?”