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Homework Help: Reaction time

  1. Feb 26, 2009 #1
    1. The problem statement, all variables and given/known data
    Use your reaction time to determine how far a car you are driving at 100km/h would travel between the time you see an emergency and the time you slam on your brakes.


    2. Relevant equations



    3. The attempt at a solution
    Given:

    v = 100km/h
    d = ?
    t = 0.27 s

    d = v*t
    d = 100 * 0.27
    =27?

    Somehow I think this is wrong.
     
  2. jcsd
  3. Feb 26, 2009 #2

    hage567

    User Avatar
    Homework Helper

    Watch your units. They need to be consistent with each other to get a meaningful answer.
     
  4. Feb 27, 2009 #3
    Ah true, so 100 * 0.000075
    = 0.0075

    Therefore, i will travel 0.0075 kilometres during that time.
     
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