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An athlete with a mass of68.0kg is in a cross country race, and at one instant he has a speed of3.10m/s. (a)What is his kinetic

An athlete with a mass of68.0kg is in a cross country race, and at one instant he has a speed of3.10m/s.

(a)What is his kinetic energy at this instant?

KEi= (b)If he wishes to doubles his speed to reach the finish line, his kinetic energy will change by what factor?

KEf
KEi

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