In a mechanical system, it is a law that energy should be conserved. In this case, what is the initial energy should be equal to the total energy after the motion happened. We do as follows:
PE(at rest) = KE(during motion) + PE(after motion)
51450 J = KE(during motion) + 32781 J
KE(during motion) = 18669 J
24 laps
1 hour = 60 minutes
4/10 x 60 = 24
The answer is 5.2
you must have written the equation incorrectly
