The expression for displacement of an object in SHM is \( x=A \cos \omega t \). The potential en...

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The expression for displacement of an object in SHM is \( x=A \cos \omega t \). The potential energy at \( t=T / 4 \) is
(a) \( \frac{1}{2} k A^{2} \)
(b) \( \frac{1}{8} k A^{2} \)
(c) \( \frac{1}{4} k A^{2} \)
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