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A 61-kg sprinter starts a race with an acceleration of 4.99 m/s2. What is the net external force on him? 2. If the sprinter from

A 61-kg sprinter starts a race with an acceleration of 4.99 m/s2. What is the net external force on him? 2. If the sprinter from the previous problem accelerates at that rate for 20 m, and then maintains that velocity for the remainder of the 100-m dash, what will be his time for the race

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