Three masses $700g, 500g$ and $400g$ are suspended at the end of a spring a shown and are in equilibrium. When the $700g$ mass is removed, the system oscillates with a period of $3\,seconds$, when the $500g$ mass is also removed, it will oscillate with a period of .... $s$
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$\mathrm{T}=2 \pi \sqrt{\frac{\mathrm{m}}{\mathrm{R}}}$
$\frac{3=2 \pi \sqrt{\frac{0.9}{\mathrm{k}}}}{\mathrm{T}=2 \pi \sqrt{\frac{0.4}{\mathrm{k}}}}$
$\mathrm{T}=2 \mathrm{sec}$
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