A particle is executing $S.H.M.$ If its amplitude is $2 \,m$ and periodic time $2$ seconds, then the maximum velocity of the particle will be
  • A$\pi \,m/s$
  • B$\sqrt {2\pi } \,m/s$
  • C$2\pi \,m/s$
  • D$4\pi \,m/s$
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