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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

`(2mg)/(k)`

B

`(mg)/(k)`

C

`(3mg)/(2k)`

D

`(mg)/(2k)`

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The correct Answer is:
A
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