$A$ particle is performing $S.H.M.$ about its mean position with an amplitude $a$ and periodic time $T$. The speed of the particle when its displacement from the mean position is $\frac{a}{3}$ will be:

  • A
    $\frac{2 \pi a}{T}$
  • B
    $\frac{4 \sqrt{2} \pi a}{3 T}$
  • C
    $\frac{4 \pi^2 a}{3 T}$
  • D
    $\frac{\sqrt{3} \pi^2 a}{2 T}$

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