A (25-mathrm{kg}) mass is attached to a hardening spring with (k_{1}=1000 mathrm{~N} / mathrm{m}) and (k_{3}=4,000 mathrm{~N}

Question:

A $25-\mathrm{kg}$ mass is attached to a hardening spring with $k_{1}=1000 \mathrm{~N} / \mathrm{m}$ and $k_{3}=4,000 \mathrm{~N} / \mathrm{m}^{3}$. The mass is displaced $15 \mathrm{~mm}$ from equilibrium and released from rest. What is the period of the ensuing oscillations?

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