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v n=0,28 m/s
Jeżeli plynie z pradem, to jej predkosc powieksza sie o predkosc nurtu rzeki
1,4 m/s+0,28 m/s=1,68 m/s
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Jezeli plynie pod prad, to jej predkosc zmniejsza sie o predkosc nurtu
1,4 m/s-0,28m/s=1,12 m/s
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