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r = 5 m
f = 12 obr/ min = 12obr / 60 s = 1/ 5 s (częstotliwość)
V= ?
V = 2pi r/ T
T = 1 / f
V = 2pi r* f
V = [ m /s ]
V = 2 * 3,14 * 5 m* 1 / 5s= 6,28m/s