A block of mass m attached in the lower ...

A block of mass `m` attached in the lower and vertical spring The spring is hung from a calling and force constant value `k` The mass is released from rest with the spring initially unstreched The maximum value of extension produced in the length of the spring will be

`2 Mg/k`

`4 Mg/k`

`Mg/2k`

`Mg/k`

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