A block of mass m, attached to a spring of spring constant $k$, oscillates on a smooth horizontal table. The other end of the spring is fixed to a wall. The block has a speed $v$ when the spring is at its natural length. Before coming to an instantaneous rest, if the block moves a distance $x$ from the mean position, then
  • A$ x = \sqrt {m/k} $
  • B$ x ={1 \over{ v}} \sqrt {m/k} $
  • C$ x =v \sqrt {m/k} $
  • D$ x = \sqrt {mv/k} $
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