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Two blocks A and B of mass m and `2m` respectively are connected by a light spring of force constant k. They are placed on a smooth horizontal surface. Spring is stretched by a length x and then released. Find the relative velocity of the blocks when the spring comes to its natural length

A

`(sqrt((3k)/(2m)))`x

B

`(sqrt((2k)/(3m)))`x

C

`sqrt((2kx)/(m))`

D

`sqrt((3km)/(2x))`

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