What is the accuracy in the determined value of g, Physics

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The length of a simple pendulum is about 100cm known to have a accuracy of 1mm.Its period of oscillation is 2s determined by measuring the time for 100oscillations using a clock of 0.1s 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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