Answers
considering hooke's law
k = mg / x = 12* 10^-3* 9.8 / 0.044
k = 2.6727 N/m
as we know from frequency
(2 pi/ T) ^2 = k/m
(2 pi / T) ^2=2.6727 / 0.03
T = 0.665 s
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