How do we measure time in sports?, People used a stopwatch in the past., It’s more advanced now., Let’s look at the 100-meter race., Judges use lasers to measure time., They can also use a special camera., This camera can take 2,000 pictures a second!, These are very accurate tools., Marathons are longer races., They need a different tool., Marathon runners use a device in their shoes., This gives information about their speed., It also tells the judges their time.

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