A 5-kg box is on a rough horizontal surface. An external force F is applied horizontally to the box. When force F equals 4 N, the box is in motion at constant velocity. When force F equals 5 N, the acceleration of the box is closest to a) 0.2 m/s2 b)1 m/s2 c) 0 m/s2 d) 0.5m/s2

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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?”