Initially system is in equilibrium. Time period of $SHM$ of block in vertical direction is
  • A$2\pi \sqrt {\frac{m}{{3k}}} $
  • B$2\pi \sqrt {\frac{m}{{2k}}} $
  • C$2\pi \sqrt {\frac{m}{k}} $
  • D$2\pi \sqrt {\frac{{2m}}{k}} $
Diffcult
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