How long after the beginning of motion is the displacement of a harmonically oscillating particl...

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How long after the beginning of motion is the displacement of a harmonically oscillating particle equal to one half its amplitude if the period is \( 24 \mathrm{~s} \) and particle starts from rest
(a) \( 12 \mathrm{~s} \)
(b) \( 2 \mathrm{~s} \)
(c) \( 4 \mathrm{~s} \)
(d) \( 6 \mathrm{~s} \)
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