posted by Darcie .
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?
KE= 1/2 m v^2
what happens of you double v?