Car A (mass = 1000 kg) was subjected to a horizontal force of 10,000 N to allow it to move along horizontal a surface wherein friction force involved is 3000 N. Car B ( mass = 1200 kg) was subjected to a horizontal force of 7,000 N to allow it to move along a horizontal surface wherein friction force involved is 2000 N. Compare A and B’s acceleration. *       Car A’s acceleration is 1.2 times greater than B       Car B’s acceleration is ¼ that of A       Car B’s acceleration is double that of A       Car A’s acceleration is 1.7 times greater than 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?”