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Czas (t) - 2h
Vśr = s/t
Vśr = 40 km/h
Vśr = 80 * 1000 / dzielone przez 2 * 3600 (zera skracasz)
Vśr = 80 * 10/2*36 = 800/72 = w przybliżeniu 11 m/s