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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

`4 Mg//k`

B

`2 Mg//k`

C

`Mg//k`

D

`Mg//2k`

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