The displacement of an object attached to a spring and executing si...

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The displacement of an object attached to a spring and executing simple harmonic motion is given by \( x=2 \times 10^{-2} \) \( \cos \pi \mathrm{t} \) metre. The time at which the maximum speed first occurs is
(a) \( 0.25 \mathrm{~s} \)
(b) \( 0.5 \mathrm{~s} \)
(c) \( 0.75 \mathrm{~s} \)
(d) \( 0.125 \mathrm{~s} \)
\( \mathrm{W} \)
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