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 .... $s$
A$1$
B$2$
C$\sqrt 3$
D$\sqrt{\frac{12}{5}}$
Medium
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B$2$
b $\mathrm{T}=2 \pi \sqrt{\frac{\mathrm{m}}{\mathrm{R}}}$
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