Question

explain giving reasons a situation where you would use a stop watch

Answer 1

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.
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Answer 2

A stopwatch is a handheld timepiece designed to measure the amount of time elapsed from a particular time - when it is activated - to the time when it ... Some may have a connector.