Newton's second law states F = ma. Which of the following scenarios must be true? A. You lift upward on a tree branch, and it accelerates upward. B. When struck with the same amount of force, a hollow ping pong ball has a larger acceleration than a solid golf ball of the same size. C. When the mass of soil in a wheelbarrow is doubled, the force must be doubled to maintain the same acceleration

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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?”