See image attached) mA has a mass of 3.5 kg, and mB has a mass of 4 kg.  The coefficient of friction between mA and the table is 0.35. What is the weight of mA? What is the weight of mB? What is the force of friction between mA and the table? What is the acceleration of the system? What is the tension in the string?

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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?”