A 48-kg boy is running on a track at 6m/s. What is the boys kinetic energy?

Given:

m = 48 kg, the mass of the boy

v = 6 m/s, the boy's running speed

By definition,

the kinetic energy (KE) of the boy is

KE = (1/2) * m*v²

= 0.5 * (48 kg) * (6 m/s) ²

= 864 J

Answer: 864 J

864 J In order to calculate kinetic energy the mass of the moving body and it's velocity must be known. In this case the mass is 48 kg and the velocity is 6 m/s. The formula for kinetic energy is: Kinetic Energy = 1/2 * (Mass) * (Velocity^2) = 1/2 (48 kg) * ((6 m/s) ^2) = 864 kg * (m/s) ^2 = 864 J