Let's say Jack is running in two 5k races (for the uninitiated, 5k races are 5km long). And in the one, Jack carries a water bottle weighing 2N and he finishes in 32 min. IN the second one, he carries the same water bottle, but finishes in 30min. How much work did Jack do by carrying that water bottle in race 1? Race 2? How much power did he exert in race 1? Race 2?

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@Michele_Laino

I think that if the velocity is constant, along each race, then the work done is null, in both races

the gravity is perpendicular with respect to the direction of the race

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