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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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