The least count of a stopwatch is \( 1 / 5 \mathrm{~s} \). The time for \( \mathrm{P} \) 20 osci...

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The least count of a stopwatch is \( 1 / 5 \mathrm{~s} \). The time for
\( \mathrm{P} \) 20 oscillations of a pendulum is measured to be

W. 25 seconds. \( \% \) is the percentage error in the measurement of time.
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