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Homework Help: Human Reaction Time

  1. Feb 20, 2008 #1
    I need some help figuring out how to proceed.
    1. The problem statement, all variables and given/known data
    Make up a ruler, that can measure human reaction time in time intervals of 0.05s. There supposed to be 6 intervals in total.
    We did a similar experiment in class, where a student drops a ruler and I need to catch it as fast as I can. The displacement (cm as shown on the ruler) was 17cm.

    3. The attempt at a solution
    I used a uniform acceleration equation: displacement = (Initial Velocity)(change in time) + 1/2(Acceleration due gravity)(change in time)^2
    and found the time to be 0.18s for the 17 cm.

    So now I need to make a ruler that will calculate time instead of displacement.
    However I don't know what values to use every 0.05s on the ruler.
  2. jcsd
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