A mass with a m mass is being pulled along a horizontal rope with a constant tension T at angle theta above the horizontal. If the coefficent of kinetic friction is μk, what is the acceleration a of the mass?

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Q: kinetic

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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?”