Question: A runner whose mass is 5 1 kg accelerates from a stop to a speed of 7 m / s in 4 seconds. ( A

A runner whose mass is 51 kg accelerates from a stop to a speed of 7 m/s in 4 seconds. (A good sprinter can run 100 meters in about 10
seconds, with an average speed of 10 m/s.)

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