The length of a seconds pendulum is .... $cm$
$99.8$
$99$
$100$
None of these
(b )$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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