$A$ 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
    $x = \frac{1}{v} \sqrt{m/k}$
  • C
    $x = v \sqrt{m/k}$
  • D
    $x = \sqrt{mv/k}$

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