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V = 80km/h = 22m/s
Fop = 400N
P = ?
Szukane:
P = ?
V = const
Fop = Fc - Siły opory są równe sile ciągu silnika
P = W/t
W = F * s
P = F * s/t
W ruchu jednostajnym V=s/t ,czyli:
P = F * V
P=400N*22m/s
P=8800W
Odp: Moc silnika wynosi 8800 W.