Block \( A \) is hanging from a vertical spring and is at rest. Block \( B \) strikes block \( A...

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Block \( A \) is hanging from a vertical spring and is at rest. Block \( B \) strikes block \( A \) with velocity \( v \) and sticks to it. Then the value of \( v \) for which the spring just attains natural length is
(1) \( \sqrt{\frac{60 m g^{2}}{k}} \)
(2) \( \sqrt{\frac{6 m g^{2}}{k}} \)
(3) \( \sqrt{\frac{10 m g^{2}}{k}} \)
(4) None of these
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