you can test reaction in a series of ways:
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The most common being by taking a long pole and making two marks on it of a certain distance apart such as a metre.
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get someone to hold the pole with the first mark level to your hand.
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take a stopwatch.
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get the other person to drop the pole and start the stop watch catch the pole as soon as you can and stop the stop watch.
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use these to calculate the speed of your reaction.