In an investigation a student placed a 0.85 kg cart on a table. They tie one end of a light string (assume mstring= 0kg) to the front of a cart, passes it through a pulley and then onto a 0.50 kg hanging mass. Assume there is no friction. Determine the magnitude of the acceleration of the cart. Determine the magnitude of the tension.

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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?”