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Stopwatch
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A stopwatch is a tool used to measure the amount of time something takes. For example, to learn how soon a car can reach 60 miles per hour, or how much time it takes a runner to run 40 yards. These days, stopwatches are even installed in digital watches. You press a button to start the time and press it again to stop the time. A stopwatch can tell you the time in seconds, hundredths of a second, or thousandths of a second.
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