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r=2m
Obl T
obwod=2πr
T=obw/V=2πr/V=2*π*2/12=π/3s=3,14159265/3=1,04719755s
T=1,04719755s
pozdr
T=2piR/V
T=6,28x2m/12m/s
T=1,047s