# physics

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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
=

• physics -

KE= 1/2 m v^2

what happens of you double v?

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