Posted by corey on .
A 65.0kg runner has a speed of 5.20 m/s at one instant during a longdistance 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

physics 
drwls,
(a) K.E. (1/2) M V^2 = ___ joules ?
(b) doubling V quadruples the kinetic energy.
You do the numbers. 
physics 
Anonymous,
87.88J

Physics 
Princess,
A 65.0kg 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?