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Quick question on a simplification of position formula

  1. Sep 29, 2009 #1
    1. The problem statement, all variables and given/known data

    I'm having issues simplifying the following position formula.

    2. Relevant equations


    http://imgur.com/y1tgG.jpg

    3. The attempt at a solution

    Its probably something really stupid I'm not realizing but i don't understand how under the square root 127 got to be 127 and not 127^2.

    Since in the orig problem when you solve for V^2 you'd end up with

    V^2= (127^2)(g)/ ((2)(80.8))
    [
     
  2. jcsd
  3. Sep 30, 2009 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    Welcome to PF!

    Hi skurred! Welcome to PF! :smile:

    (try using the X2 tag just above the Reply box :wink:)

    Yes, you're right … (g/2)(127/v)2 = 80.8, so v = 127√(g/(2*80.8)) :smile:

    (is this from a book? :redface:)
     
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