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r = 40 cm= 0,4 m
f = ? T = ?
V = 2pir/T
V*T = 2pi r
T = 2pir/V
T = 2*3,14 *0,4 m/16,4 m/s
T = 0,15 s
f = 1/T
f = 1/0,15 s
f = 6,67 1/s = 6,67 Hz