Posted by **corey** on Thursday, March 1, 2012 at 11:56pm.

A 65.0-kg runner has a speed of 5.20 m/s at one instant during a long-distance event. (a) what is the runner's kinetic energy at this instant? (b) if he doubles his speed to reach the finish line, by what factor does his kinetic energy change

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**drwls**, Friday, March 2, 2012 at 5:14am
(a) K.E. (1/2) M V^2 = ___ joules ?

(b) doubling V quadruples the kinetic energy.

You do the numbers.

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**Anonymous**, Thursday, March 29, 2012 at 1:01am
87.88J

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**Princess**, Monday, October 3, 2016 at 9:53pm
A 65.0-kg runner has a speed of 5.20 m/s at one instant during a long distance event (a) What is the runnerâ€™s kinetic energy at this instant? (b) If he doubles his speed to reach the finish line, by what factor does his kinetic energy change?

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