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Relative length problem

  1. May 5, 2007 #1
    I'm attempting a question that reads: A moving meter stick is measured to be 80 cm. What is its speed?

    The related formula is L = Lo/gamma where gamma = 1 / (1 - (v/c)^2)^(1/2)

    I looked at the solution provided and the first statement is: Lo = 100cm. I understand the rest from there but I have no idea where this 100cm comes from. Can anyone explain?
  2. jcsd
  3. May 5, 2007 #2


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    Science Advisor

    They said it was a "meter stick", and 1 meter = 100 cm. This must be its length in its own rest frame.
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