A) 42.41 s
B) 75.4 s
C) 20.85 s
D) 85 s
Correct Answer: C
Solution :
The period of oscillation, \[T=2\pi {{\left[ \frac{{{\left( Radius\text{ }of\text{ }gyration \right)}^{2}}}{metacentric\text{ }height\times g} \right]}^{1/2}}\] \[=2\pi {{\left[ \frac{{{9}^{2}}}{0.75\times 0.81} \right]}^{1/2}}=20.85s\]
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