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s1 = 400m
t1 = 3.20 min = 200s
s2 = 100m
t2 = 1.40 min = 100s
V= s/t
sprawdzanie jednostki
[V] = [m/s]
rozw.
V1 + V2 = V
s1/t1 + s2/t2 = V
400/200 + 100/100 = V
2+1= V
Vc- predkość średnia
Vc = 3:2 = 1.5 m/s
odp. średnia prędkość janka to 1,5m/s