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:
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:
- 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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- [JEE MAIN 2022]