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V=72km/h=20m/s
P=W/t=F*s/t=F*V
P= 4000 N * 72km/h = 4 000N * 20m/s = 80 000 W
F=4kN=4000N
P=?
P=W/t W=Fs
P=Fs/t V=s/t
P=FV
P=4000*20=80000W=80kW