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Questions  

 An ideal spring with spring constant.k is hung from the ceiling and a block of mass M is attached to its lower end. The mass is released with the spring
initially unscratched. Then the maximum extension in the spring is

a
4Mg/k
b
2 Mg/k
c
Mg/k
d
Mg/2k

detailed solution

Correct option is B

Here Mgy=12ky2 y=(2Mg/k)

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