A student uses a simple pendulum of exactly 1 m length to determine g , the acceleration due to gravity. He uses a stop watch with the least count of 1 sec for this and records 40 seconds for 20 oscillations. For this observation, which of the following statement(s) is (are) true?
Select ALL correct options:
A
Error $\Delta \mathrm{T}$ in measuring T , the time period, is 0.05 seconds
B
Error $\Delta \mathrm{T}$ 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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