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V₂=30m
t₁=15s
t₂=15s
v=s/t
V₁=60/15=4m/s
V₂=30/15=2m/s
Vśr=?
Vśr=(4+2):3 =6:2=3M/S
odp. predkosc srednia wynosila 3 m/s