Starting from the origin a body oscillates simple harmonically with...

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Starting from the origin a body oscillates simple harmonically with a period of \( 2 \mathrm{~s} \). After what time will its kinetic energy be \( 75 \% \) of the total energy?
(a) \( \frac{1}{6} \mathrm{~s} \)
(b) \( \frac{1}{4} \mathrm{~s} \)
(c) \( \frac{1}{3} \mathrm{~s} \)
(d) \( \frac{1}{12} \mathrm{~s} \)
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