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Block A is hanging from a vertical sprin...

Block `A` is hanging from a vertical spring and is at rest. Block `B` strikes the block `A` with velocity `v` and sticks to it. Then the value of `v` for which the spring just attains natural length is

A

`sqrt((60 mg^2)/k)`

B

`sqrt((6 mg^2)/k)`

C

`sqrt((10 mg^2)/k)`

D

None of these

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The correct Answer is:
B
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