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W ciągu 2h koń przeciągnie wóz o s=vt=1,5*7200=10800m
Praca = F*s=400*10800=4320000J
90m/min | * 60
5400m/h | * 2
10800m/2h
W=F * s
W = 10800 * 400
W=4320000[J]