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Damping is negligible for a 0.162 kg mass hanging

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Answer #1

\omega = sqroot ( k/m \pmF/mA)

where K = spring constant = 6.15 N/m

m=0.162 kg

f= 1.82

A = 0.145 m

\omega = sqroot (39.963 \pm 27.071)

so possible frequencies are : 8.187 and 3.59 apprx

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