Three horizontal ropes pull on a large stone stuck in the ground, producing the vector forces A, B, and C as shown. Find the magnitude and direction of a fourth force on the stone that will make the vector sum of the four forces zero.

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Q: . Find the resultant force.

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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?”