If a 0.450-kg object (m1) is connected to a 0.0400-kg mass (m2) and a constant frictional force of 0.100N acts on the object. Solve for the acceleration a

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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?”