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The period of oscillation of a simple pendulum is T = g L 2 π . Measured value of L is 20.0 cm known to 1 mm accuracy and time for 100 oscillations of the pendulum is found to be 90 s using a wrist watch of 1s resolution. The accuracy in the determination of g is -

1. 2 %
2. 3 %
3. 1 %
4. 5 %

Correct answer: 3 %

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