Two crates connected by a rope of negligible mass lie on a horizontal surface. (See Figure 5.54.) Crate A has mass mA and crate B has mass mB. The coefficient of kinetic friction between each crate and the surface is mk. The crates are pulled to the right at a constant velocity

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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?”