An adventurous Bravestone must cross a river and starts running toward it. As he runs, he notices a rope hanging from a tree limb. He grabs the rope and swings. Which of the following statement is true as Bravestone reaches the lowest point of the swing?   a. the tension in the rope is equal to his mass times his acceleration.   b. the tension in the rope is greater than his weight.   c. his acceleration is downward at .    d. the tension in the rope is equal to his weight.

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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?”