Final answer:
The kinetic energy of the runner is approximately 689.7384 Joules.
Step-by-step explanation:
Kinetic energy is the energy possessed by an object due to its motion. It is given by the formula:
Kinetic energy (KE) = 0.5 * mass * speed^2
In this case, the mass of the runner is 62.6 kg and the speed is 4.70 m/s. Plugging in these values into the formula:
KE = 0.5 * 62.6 kg * (4.70 m/s)^2
KE = 0.5 * 62.6 kg * 22.09 m^2/s^2
KE = 689.7384 J
Therefore, the kinetic energy of the runner is approximately 689.7384 Joules.