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P=30kW=30000W
v=72 km/h =20 m/s, v=const
szukane:
F=?
rozwiazanie
P=W/t W=F*s
P=F*s/t v=s/t
P=F*v=>F=P/v
F=30000/20 [W/(m/s)]= 1500 [(N*m/s)*s/m]=1500 [N]
P=30kW=30000J
P=F*V
F=P/V
F=30000J/s / 20m/s
F=1500N