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An ideal spring with spring constant k i...

An ideal spring with spring constant k is hung from the ceiling and a block of mass M is attached to its lower end. The mass is released with the spring initially unstretched. Then the maximum extension in the spring is

A

`(4Mg)/k)`

B

`(2Mg)/k`

C

`(Mg)/k`

D

`(Mg)/(2k)`

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