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A student uses a simple pendulum of exac...

A student uses a simple pendulum of exactly `1m` length to determine `g`, the acceleration due ti gravity. He uses a stop watch with the least count of `1sec` for this and record `40 seconds` for `20` oscillations for this observation, which of the following statement `(s) is (are)` true?

A

Error `triangle T` in measuring T, the time period, is 0. 05 second

B

Error `triangle T` in measuring T, the time period, is 1 second

C

Percentage error in the determination of g is 5%

D

Percentage error in the determination of g is 2.5%

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