A 7kg box is released on an incline as shown. The coefficient of kinetic friction is 0.24. Neglect drag. How many forces are acting on the box? 3 What is the magnitude of the normal force? 57.6 N What is the magnitude of the friction? 13.8 N What is the magnitude of the net force? N What is the magnitude of box's acceleration? 63 m/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?”