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Reaction time of dollar falling between fingers

  1. Jan 29, 2014 #1
    1. The problem statement, all variables and given/known data
    If you are worried about safely driving after a party, I recommend you just not drive! But if you want to
    see when you are finally okay to drive, here is a test to see if you are still too “impaired”. Take a dollar bill
    and have a friend hold the bill from one of the short sides hanging straight down. Place your thumb and
    forefinger opposite the bottom of the bill. Have your friend release the paper suddenly and try to catch it
    with your thumb and forefinger. If you can catch this bill three times in a row, you are not too badly
    impaired. Assuming the bill was falling freely without air resistance (not a bad assumption for the paper
    falling sideways), calculate your reaction time. That is, how long does it take for the entire length of the
    bill to fall between your fingers? (Use your hand to measure a dollar bill based on your body

    i know that the acceleration is -9.8m/s2

    2. Relevant equations
    I was thinking of using d = vit + 1/2at2

    but i dont know d

    3. The attempt at a solution

    if i do know d am i choosing the right equation?
  2. jcsd
  3. Jan 30, 2014 #2


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