A plank with a small block on top of it is under going vertical SHM...

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A plank with a small block on top of it is under going vertical SHM. Its period is \( 2 \mathrm{sec} \). The minimum amplitude at which the block will separate from plank is :
\( \mathrm{P} \)
(A) \( \frac{10}{\pi^{2}} \)
(B) \( \frac{\pi^{2}}{10} \)
(C) \( \frac{20}{\pi^{2}} \)
(D) \( \frac{\pi}{10} \)
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