When a mass $m$ is hung from the lower end of a spring of neglibgible mass, an extension $x$ is produced in the spring. The time period of oscillation is
  • A$T = 2\pi \sqrt {\frac{x}{{mg}}} $
  • B$T = 2\pi \sqrt {\frac{gx}{{m}}} $
  • C$T = 2\pi \sqrt {\frac{x}{{g}}} $
  • D$T = 2\pi \sqrt {\frac{x}{{2g}}} $
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