A particle in $SHM $ is described by the displacement equation $x(t) = A\cos (\omega t + \theta ).$ If the initial $(t = 0)$ position of the particle is $1 \,cm$ and its initial velocity is $\pi $cm/s, what is its amplitude? The angular frequency of the particle is $\pi {s^{ - 1}}$
  • A$1\, cm$
  • B$\sqrt 2 \,cm$
  • C$2\, cm$
  • D$2.5\, cm$
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