Two crates A and B are connected by a light rope along the horizontal surface. Mass of A is 4 kg and the mass of B is unknown. A force F= 40 N is exerted to the right moving the blocks at a constant speed (zero acceleration). The coefficient of friction between all surfaces is 0.34. What friction force is exerted on B?

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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?”