Posted by **Darcie** on Thursday, February 23, 2012 at 8:48pm.

A 59.0-kg runner has a speed of 3.20 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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