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W= F*s [praca = siła* przesunięcie]
P = F*s / t [czyli moc = sila*przesuniecie / czas]
s/t = V [droga (przesuniecie) / czas = predkosc ]
P = F*V [moc = siła *predkosc]
F = P/V [sila = moc / predkosc]
V= 18km/h = 18*1000/3600m/s = 5m/s
P = 75W
F = 75W / 5m/s = 15 N