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F=300N
2160kJ=300N*s
s=7,2km
v=7,2km/h
W - praca = 2160 kJ = 2160000 J
t - czas = 1 h = 3600 s
W = Fs
s - droga = vt
v - prędkość
W = Fvt
v = W/Ft = 2160000/300 razy 3600 = 2160000/1080000 = 2 m/s
odp
prędkość wynosi 2 m/s