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If someone can help me with the correct equation to use, I would be gratly obliged!

  1. Nov 18, 2009 #1
    A 55kg skateboarder wants to make it to the upper edge of a quarter pipe with a radius 3.0 m. What speed do they need at the the bottom?
    A.) 7.7 m/s
    B.) 9.1 m/s
    C.) 5.4 m/s

    If you could help me out with the correct formula to use, that would help!!!!
     
  2. jcsd
  3. Nov 18, 2009 #2
    Re: If someone can help me with the correct equation to use, I would be gratly oblige

    Sorry new to the site... Revised the question on a later post
     
  4. Nov 19, 2009 #3
    Re: If someone can help me with the correct equation to use, I would be gratly oblige

    Hello Yomama

    This can be done very quickly and effectivelly with the assistance of two energy equations:

    Potential energy=mgh
    Kinetinc Energy=(mv^2)/2

    Equate the two in the following way:

    mgh=(mv^2)/2 Note: m cancelles out

    gh=(v^2)/2
    2gh=v^2
    v=sqrt(2gh) where: g=9.81, h=radius of pipe=3

    Find v by substituting the value.

    Hubert
     
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