Reaction time is the amount of time it takes you to react to something. One example is when you put your hand 5 cm below a ruler and see how fast you can catch it . Second example of a reaction is when your like texting and trying to catch the ruler at the same time to see how fast you can get it or if you can't . Third example is when your running to half of a basketball court will someone else try's to shot a point and see which one is faster.
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