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 $500 \,gm$ mass is also removed, it will oscillate with a period of ...... $s$
  • A$1$
  • B$2$
  • C$3$
  • D$\sqrt {\frac{{12}}{5}}$
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