A simple pendulum is suspended in a car. The car starts moving on a horizontal road according to equation  $x\, = \,\frac{g}{2}\,\sqrt 3 {t^2}$. Find the time period of oscillation of the pendulum.
  • A$2\pi \sqrt {\frac{l}{g}} $
  • B$\pi \sqrt {\frac{2l}{g}} $
  • C$2\pi \sqrt {\frac{l}{8g}} $
  • D$2\pi \sqrt {\frac{l}{g\sqrt 3}} $
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