Block $A$ is hanging from a vertical spring and it is at rest. Block $'B'$ strikes the block $'A'$ with velocity $v$ and stick to it. Then the velocity $v$ for which the spring just attains natural length is:

822-654

  • A

    $g\sqrt[]{\frac{2m}{k}}$

  • B

    $g\sqrt{\frac{6m}{k}}$

  • C

    $g\sqrt{\frac{10m}{k}}$

  • D

    $g\sqrt{\frac{14m}{k}}$

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