Time intervals measured with a stopwatch typically have an uncertainty of about 0.2 s, due to human reaction time at the start and stop moments. What is the percent uncertainty of a hand-timed measurement of
- 5.5 s,
- 55 s,
- 5.5 min?
Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.
a) $4 \%$
b) $0.4 \%$
c) $0.06 \%$
Error in the video: I mistakenly wrote fractional errors instead of percent errors. The answers written above are correct, not the answers in the video, although the working in the video is correct.