Consider the cart on a frictionless track, shown below. For each question, one or more features of the setup have been changed. Assume that there is no friction. You are to indicate what effect the change will have on the acceleration compared to the original setup, which is shown below.   (The picture with the cart going in a horizontal direction is the original setup)   (The picture with the 20 degree incline on the diagram is the modified setup)   3. What happens to the acceleration if the track is inclined at a 20 degree angle?   A. The acceleration will be greater than the original setup. B. The acceleration will be less than the original setup. C. The acceleration remains the same. D. It's not possible to tell.

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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?”