A block of mass M is attached to the lower end of a vertical spring. The spring is hung from a ceiling and has force constant value k. The mass is released from rest with the spring initially unstretched. The maximum extension produced in the length of the spring will be :

1. A. Mg /2k
2. B. Mg /k
3. C. 2 Mg /k
4. D. 4 Mg /k

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