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Homework Help: Radius and speed

  1. Dec 15, 2009 #1
    A student runs on a circular track that has a radius of 135 m. If she accelerates at 0.60 m/s2, what is her speed?

    a=V2/R?
    0.62m/s2 /135m??

    I think I def have the wrong formula, is anyone able to help me out to find speed?
     
  2. jcsd
  3. Dec 15, 2009 #2

    rock.freak667

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    you have the correct formula, v2=aR, so just get v
     
  4. Dec 15, 2009 #3
    How do I get the v? :) thank you
     
  5. Dec 15, 2009 #4

    rock.freak667

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    take the square root.
     
  6. Dec 15, 2009 #5
    v2=aR
    0.62m/s2 /135m
    0.004
    sqare root = 0.26?
    Im def doing something wrong, maybe im putting it in my calculator wrong
     
  7. Dec 15, 2009 #6

    rock.freak667

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    You should be multiplying, not dividing as you are doing.
     
  8. Dec 15, 2009 #7
    thank you! :)
     
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