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.
(1) \( 12 \mathrm{~s} \)
(2) \( 2 s \)
(3) \( 4 \mathrm{~s} \)
(4) \( 6 s \)
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