A $S.H.M.$ has amplitude $‘a’$ and time period $T$. The maximum velocity will be
  • A$\frac{{4a}}{T}$
  • B$\frac{{2a}}{T}$
  • C$2\pi \sqrt {\frac{a}{T}} $
  • D$\frac{{2\pi a}}{T}$
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