A) \[Mg/k\]
B) \[-\,2\text{ }Mg/k~\]
C) \[4\,\,Mg/k\]
D) \[Mg/2k\]
Correct Answer: B
Solution :
| Key Idea Use the law of conservation of energy. |
| Let y be the extension in the spring. |
| Applying conservation of energy |
| \[mgx-\frac{1}{2}\,k{{x}^{2}}=0-0\Rightarrow x=\frac{2mg}{k}\] |
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