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What is the period of small oscillations of the block of mass $m$ if the springs are ideal and pulleys are massless ?
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$\mathrm{T}=2 \pi \sqrt{\frac{\mathrm{m}}{\mathrm{k}_{\mathrm{eq}}}}$

$\mathrm{F}_{\mathrm{net}}=-(4 \mathrm{k})(4 \mathrm{x})=-16 \mathrm{kx}$

$\Rightarrow \mathrm{k}_{\mathrm{eq}}=16 \mathrm{K}$

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