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Calculating meters per second

  1. Jan 9, 2010 #1
    I'm looking at a multiple choice test here and heres one of the questions
    Q.) Your hair grows 5mm per week. What is its speed in m/s?

    I calculating everything to appropriate units and got
    time = 604800 seconds
    length = 0.005 metres

    then to get the rate of metres per second I divided 0.005m / 604800s and got
    8 x 10-9 m/s
    None of the multiple choices match that answer though. The closest answer is 5 x 10-9 m/s
    I assume I did something wrong here but I can't see what.
  2. jcsd
  3. Jan 9, 2010 #2


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    Science Advisor
    Homework Helper

    Your answer looks good to me. The creator of the test must have made an error, or you have read the question incorrectly.
  4. Jan 9, 2010 #3
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