The length of a simple pendulum is about \( 100 \mathrm{~cm} \) known to have an accuracy of \( ...

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The length of a simple pendulum is about \( 100 \mathrm{~cm} \) known to have an accuracy of \( 1 \mathrm{~mm} \). Its period of oscillation is \( 2 \mathrm{~s} \) determined by measuring the time for 100 oscillations using a clock of \( 0.1 s \) resolution. What is the accuracy in the determined value of \( g \) ?
(A) \( 0.2 \% \)
(B) \( 0.5 \% \)
(C) \( 0.1 \% \)
(D) \( 2 \% \)
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