A particle executes $S.H.M.$ with a period of $6$ second and amplitude of $3\, cm$. Its maximum speed in $cm/sec$ is
AIIMS 1982, Easy
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(b) ${v_{\max }} = a\omega = a\frac{{2\pi }}{T} = 3 \times \frac{{2\pi }}{6} = \pi \,cm/s$
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