To the free end of a spring hanging from a rigid support, a block of mass $m$ is hung and slowly allowed to come to its equilibrium position. Then the stretching in the spring is $d$. If the same block is attached to the same spring and allowed to fall suddenly, the amount of maximum stretching is: (force constant, $k$)
- A$\frac{m g}{k}$
- B$2 d$
- C$\frac{m g}{3 k}$
- D$4 d$
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