A particle is attached to a vertical spring and is pulled down a distance \( 4 \mathrm{~cm} \) b...

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A particle is attached to a vertical spring and is pulled down a distance \( 4 \mathrm{~cm} \) below its equilibrium and is released from rest. The initial upward acceleration is \( 0.5 \mathrm{~ms}^{-2} \). The angular frequency of oscillation is
(a) \( 3.53 \mathrm{rad} / \mathrm{s} \)
(b) \( 0.28 \mathrm{rad} / \mathrm{s} \)
(c) \( 1.25 \mathrm{rad} / \mathrm{s} \)
(d) \( 0.08 \mathrm{rad} / \mathrm{s} \)
\( \mathrm{P} \)
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