Two blocks of mass $2\ kg$ and $1\ kg$ are connected by an ideal spring on a rough surface. The spring in unstreched. Spring constant is $8\ N/m$ . Coefficient of friction is  $μ = 0.8$ . Now block $2\ kg$ is imparted a velocity $u$ towards $1\ kg$ block. Find the maximum value of velocity $'u'$ of block $2\ kg$ such that block of $1\ kg$ mass never move is

821-19

  • A

    $\sqrt {10}\ m/s$

  • B

    $\sqrt {15}\ m/s$

  • C

    $\sqrt {20}\ m/s$

  • D

    $\sqrt {30}\ m/s$

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