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V-prędkość=12m/s
r-promień=2m
V=2πr/T
V*T=2πr
T=2πr/V
T=2π2m/12m/s
T=4πm/12m/s (skracamy 4 i 12 oraz jednostki-metry)
T=πm/3m/s (za π podstawiamy 3,14)
T=3,14/3s
T=1,04(6)s≈1,05s
Odp.: Okres wynosi 1,05s.