A simple harmonic oscillator has a period of $0.01 \,sec$ and an amplitude of $0.2\, m$. The magnitude of the velocity in $m{\sec ^{ - 1}}$ at the centre of oscillation is
A$20\pi $
B$100$
C$40\pi $
D$100\pi $
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C$40\pi $
c (c)At centre ${v_{{\rm{max}}}} = a\omega = a.\frac{{2\pi }}{T} = \frac{{0.2 \times 2\pi }}{{0.01}} = 40\pi $
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