A block of mass \( M \) is attached to the lower end of a vertical spring. The spring is hung fr...

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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[CBSE PMT 2009]
(a) \( 1 \mathrm{Mg} / \mathrm{k} \)
(b) \( 2 M g / k \)
(c) \( 4 \mathrm{Mg} / \mathrm{k} \)
(d) \( M g / 2 k \)
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