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A block of mass $m$ rests on a platform. The platform is given up and down $SHM$ with an amplitude $d$ . What can be the maximum frequency so that the block never leaves the platform
  • A$\sqrt {g/d} $
  • B$\frac{1}{{2\pi }}\sqrt {g/d} $
  • C$\frac{1}{{2\pi }}\left( {g/d} \right)$
  • D$2\pi \sqrt {d/g} $
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