Three mass and string system is in equilibrium. When $700\,gm$ mass is removed, then the system oscillates with a period of $3\,seconds$ . When the $500\,gm$ mass is also removed, then what will be new time period for system ..... $\sec$
A$1$
B$2$
C$3$
D$\sqrt {\frac{{12}}{5}}$
Medium
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B$2$
b $\mathrm{T}=2 \pi \sqrt{\frac{\mathrm{m}}{\mathrm{k}}} \Rightarrow \mathrm{T} \propto \sqrt{\mathrm{m}}$
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