The potential energy of a simple harmonic oscillator of mass $2\, kg$ in its mean position is $5\, J.$ If its total energy is $9\, J$ and its amplitude is $0.01\, m,$ its time period would be

  • A
    $\pi / 10\, s$
  • B
    $\pi / 20\, s$
  • C
    $\pi / 50\, s$
  • D
    $\pi / 100\, s$

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