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v = 2πr/T
T - okres
r - promień
T = 2s
π = 3,14
a) r = 0,1m
v = 2 * 3,14 * 0,1/2 = 0,314m/s
b) 0,2m
v = 2 * 3,14 * 0,2/2 = 0,628m/s
c) 0,5m
v = 2 * 3,14 * 0,5/2 = 1,57m/s
d) 1m
v = 2 * 3,14 * 1/2 = 3,14m/s