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 unstretched. Then the maximum extension in the spring is

\frac{4 M g}{k}

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\frac{2 M g}{k}

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\frac{M g}{k}

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\frac{M g}{2 k}

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Solution

The correct option is B $\frac{2 M g}{k}$

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