$A$ block of mass $M$ is attached to the lower end of a vertical spring. The spring is hung from a ceiling and has a force constant $k$. The mass is released from rest with the spring initially unstretched. The maximum extension produced in the length of the spring will be
- A$2 Mg/k$
- B$4 Mg/k$
- C$Mg/2k$
- D$Mg/k$
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