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A block of mass M is attached to the low...

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

A

Mg/k

B

2 Mg/k

C

4 Mg/k

D

Mg/2k

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The correct Answer is:
B
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