A 605 -kg runner has a speed of 460 ms at one instant, Ask an Expert

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A 60.5 -kg runner has a speed of 4.60 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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