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 springinitially unscratched. Then the maximum extension in the spring is

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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

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2 Mg/k

Mg/2k

$4 Mg / k$

Mg/k

answer is B.

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Detailed Solution

Here $Mgy= \frac{1}{2} k y^{2} y = (2 M g / k)$

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