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One end of a spring of force constant \( k \) is fixed to a vertical wall and the other to a block of mass \( m \) resting on a smooth horizontal surface. There is another wall at a distance \( x_{0} \) from the block. The spring is then compressed by \( 2 x_{0} \) and
\( \mathrm{P} \) released. The time taken to strike the wall is

W
(a) \( \frac{1}{6} \pi \sqrt{\frac{k}{m}} \)
(b) \( \sqrt{\frac{k}{m}} \)
(c) \( \frac{2 \pi}{3} \sqrt{\frac{m}{k}} \)
(d) \( \frac{\pi}{4} \sqrt{\frac{k}{m}} \)
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