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V = 72 km/h = 20 m/s]
t = 20 s
s = 20m/s * 20s = 400 m = 0,4 km
t=20s
Vśr=72km/h
Szukane s=?
72km/h = 72*1000/3600 m/s = 72000:3600=20m/s
Vśr=s/t
s=Vśr*t
s=20m/s*20s
s=400m.
V - prędkość
s- droga
t-czas
t=20s
V=72km/h = 20 m/s
V=s/t / x t
V x t = s
s= 20 m/s x 20 s
s= 400 m