A 97-kg sprinter wishes to accelerate from rest to a speed of 13 m/s in a distance of 22 m. (a) What coefficient of static friction is required between the sprinter’s shoes and the track? (b) Explain the strategy used to find the answer to part (a). Show your work and explain.

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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?”