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