A) 99.8 cm
B) 99 cm
C) 100 cm
D) None of these
Correct Answer: B
Solution :
\[T=2\pi \sqrt{l/g}\Rightarrow l=\frac{g{{T}^{2}}}{4{{\pi }^{2}}}=\frac{9.8\times 4}{4\times {{\pi }^{2}}}=99\ cm\]
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