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dane: W=F*s
F=500N W= 500N * 5000m =2500000 J
s=5 km=5000m P=W/t
t=2h=7200s P= 2500000 J/ 7200s=347W
zad 5
F=2kN=2000Nt=6min=360ss=4km=4000mP= \frac{F*s}{t} = \frac{2000N*4000m}{360s} =22222W ≈ 30KM