z prądem:1,4m/s+0,28m/s=1,68m/s.
pod prąd:1,4m/s-0,28m/s=1,12m/s
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z prądem:1,4m/s+0,28m/s=1,68m/s.
pod prąd:1,4m/s-0,28m/s=1,12m/s