Answer to Question #71394 in Mechanics | Relativity for Ashlyn Mitchell

Question

calculate the work done by a long distance runner during a 10km race. the mass of the runner is 52 kg. gravitational field strength is 9.8 N/kg
suggest a reason why the actual amount of work done is likely to be higher than the calculated value

Answer 1

The work done is
W=mgh=(52)(9.8)(10000)=5.1 MJ.
The actual amount of work done is likely to be higher than the calculated value because some work need to be done against friction forces.