A sprinter with a mass of 88 kg accelerates uniformly from 0 m/s to 8 m/s in 3 s. (Assume the sprinter runs in the positive horizontal direction. Indicate the direction with the sign of your answer where appropriate.) How far does the sprinter go during the 3 s?

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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?”