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V = 54 [km/h] = 54000 /3600 s = 15 [m/s]
F = 3 kN = 3000 N
Rozw.:
P = F × V = 3000N × 15 [m/s] = 45000W
P=W/t
P=(F*S)/t
P=F*V
P=3kN*15m/s=3000N*15m/s=45000W=45kW