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Homework Help: Find the speed of an object

  1. Apr 21, 2015 #1
    1. The problem statement, all variables and given/known data
    Find the speed of an object with r(t)=e^(t)<cos(t), sin(t), 1>.

    2. Relevant equations

    3. The attempt at a solution
    v(t)=e^(t)<cos(t)-sin(t), cos(t)+sin(t), 1>
    I know that the speed is abs(v(t)) and the answer in the book is sqrt(3)*e^(t). So how do I find the speed?
  2. jcsd
  3. Apr 21, 2015 #2


    Staff: Mentor

    The speed is the magnitude of your vector for v(t). How do you usually find the magnitude of a vector?
  4. Apr 21, 2015 #3
    Never mind, I got it! Thanks for helping.
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