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A particle executing SHM is described by the displacement function \( x(t)=A \cos (\omega t+\phi) \),
\( \mathrm{P} \) If the initial \( (t=0) \) position of the particle is \( 1 \mathrm{~cm} \), its initial velocity is \( \pi \mathrm{cm} \mathrm{s}^{-1} \) and its angular
W frequency is \( \pi \mathrm{s}^{-1} \), then the amplitude of its motion is
(a) \( \pi \mathrm{cm} \)
(b) \( 2 \mathrm{~cm} \)
(c) \( \sqrt{2} \mathrm{~cm} \)
(d) \( 1 \mathrm{~cm} \)
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