Difficult
An ideal spring with spring constant $k$ is suspended from the ceiling,and a block of mass $M$ is attached to its lower end. Initially,the spring is unstretched and the block is released from rest. What will be the maximum extension in the spring?
- A$4 Mg/k$
- B$2 Mg/k$
- C$Mg/k$
- D$Mg/2k$
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