A) \[2\pi \sqrt{\frac{3k}{M}}\]
B) \[2\pi \sqrt{\frac{k}{M}}\]
C) \[2\pi \sqrt{\frac{M}{2k}}\]
D) \[2\pi \sqrt{\frac{M}{3k}}\]
Correct Answer: D
Solution :
Time period \[T=2\pi \sqrt{\frac{m}{k+2k}}\] \[T=2\pi \sqrt{\frac{m}{3k}}\]
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