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The measured value of the length of a si...

The measured value of the length of a simple pendulum is `20cm` with `2mm` accuracy.The time for `50` oscillations was measured to be `40` seconds with `1` second resolution. From these measurements, the accuracy in the measurement of acceleration due to gravity is `N%`.The value of `N` is:

A

4

B

5

C

6

D

8

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