What does the slope of a graph of U(x) versus x represent? a. The magnitude of the force on the object b. The negative of the magnitude of the force on the object c. The x component of the force on the object d. The negative of the x component of the x component of the force on the 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?”