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$\sqrt{\frac{12}{5}}$
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