A 635-kg runner has a speed of 580 ms at one instant during


A 63.5-kg runner has a speed of 5.80 m/s at one instant during a long-distance event.

(a) What is the runner's kinetic energy at this instant?

KEi = J

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

KEf

KEi

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Physics: A 635-kg runner has a speed of 580 ms at one instant during
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