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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((5mg^(2))/(k))`

B

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

C

`sqrt((4mg^(2))/(k))`

D

`sqrt((8mg^(2))/(k))`

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