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f = 0,25 Hz = 0,25/s
szukane
r= ?
v = 2πrf /:2πf
r = v/2πf
r = 6,28m/s/(2π·0,25/s) = 12,56/π
π = 3,14
r = 12,56/3,14 m = 4 m
r = 4 m