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

Question #71394
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
1
Expert's answer
2017-11-30T16:01:07-0500
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.

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