Initially system is in equilibrium. Time period of $SHM$ of block in vertical direction is
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}} $
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