Which of the following is true regarding Newton's Second Law of Motion? A. Increasing the net force applied on an object would decrease its acceleration B. For the same net force, the ratio of the masses of two bodies is directly proportional to the ratio of their accelerations, C. Changes in the net force would linearly change the acceleration D. It is only friction that affects the acceleration/deceleration of an object.

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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?”