Question

What is a stopwatch? What is a least count of a mechanical stopwatch you have used in laboratories?​

Answer 1

Answer:

stopwatch is a device used to count time

least count of stop watch are second

Answer 2

Answer:

Samuel Watson, a horologist (clock and watch maker) who invented the 5 minute repeater, and made the first stopwatch. A stop watch is a device used to measure speed or duration in fractions of a second, typically for sporting or athletic events. In any race such as swimming or track a stop watch can provide split or lap times to determine an athlete's performance during an event.A mechanical stop watch can measure a time interval up to 0.1 second.It has a knob that is used to wind the spring that powers the watch.It can also be used as a start stop and reset button. The watch starts when the knob is is pressed once.

The least count of a stopwatch is 0.2 sec.