A $2\, Kg$ block moving with $10\, m/s$ strikes a spring of constant $\pi ^2 N/m$ attached to $2\, Kg$ block at rest kept on a smooth floor. The time for which rear moving block remain in contact with spring will be ... $\sec$
  • A$\sqrt{2}$
  • B$\frac{1}{\sqrt{2}} $
  • C$1 $
  • D$\frac{1}{2}$
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