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Depending on the experiment, the recording of measured time may be to the nearest 0.1 s or the nearest 1 s, even though a typical digital stopwatch has a precision of 0.01 s.
This is to account for uncertainty due to human reaction time or due to the time taken for observing whether an event has indeed occurred.
In general, unless otherwise stated in the instructions, the measured time can be to the nearest 0.01 s or 0.1 s.
