The weight in the following diagram has a mass of 0.50 kg and the cart has mass of 0.26 kg. Friction is negligible. What is the acceleration of the cart? 9.3 m/s² 7.2 m/s² 8.1 m/s² 6.4 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?”