Reaction Time/Hang Time Lab Activity
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Next, you will use the average of the distance the ruler fell (found on the previous page) to calculate your reaction time. Watch the video at the right to learn how to calculate your reaction time. Note: You may use g = 10 meters/second/second in your reaction time calculation. 

In the video above, I started with the formula shown below and to the left. The d in the formula stands for the distance the ruler falls, the g stands for the acceleration due to gravity, and the t stands for reaction time. But where did the formula actually come from? Hint: The distance in the formula is the same thing as the magnitude of displacement because we are talking about a ruler which is moving in one direction.
Compare the formula above with the six accelerated motion formulas shown to the right. Which of the six formulas at the right looks the most like the formula shown above? To find out complete the selfquiz below.
If you do not know what the six formulas at the right actually mean, click HERE to review the accelerated motion formulas. 
Where Does the Reaction Time Formula Come From? SelfQuiz
Gapfill exercise
Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!