In the situation as shown in figure time period of vertical oscillation of block for small displacements will be 
  • A$2\pi \cos \theta \sqrt {\frac{m}{{2k}}} $
  • B$2\pi \sec \theta \sqrt {\frac{m}{{2k}}} $
  • C$2\pi \sin \theta \sqrt {\frac{m}{{2k}}} $
  • D$2\pi \cos ec\theta \sqrt {\frac{m}{{2k}}} $
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