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V1 = V2 = V
korzystam z wzoru na prędkość liniową w ruchu obrotowym: V = 2pir/T i obl T
V*T = 2pir
T = 2pir/V
T1 = 2pir1/V
T2 = 2pir2/V
T1/T2 = 2pir1/V / 2pir2/V ; mnożę przyzb odwrotność drugiego ułamka
T1 / T2 = 2pir1/v * V/2pir2
T1/T2 = r1/r2
T1/T2 = 2/3