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Where have i gone wrong with this basic mechanics question?

  1. Aug 11, 2010 #1
    1. The problem statement, all variables and given/known data

    [PLAIN]http://img155.imageshack.us/img155/7789/questionz.jpg [Broken]


    3. The attempt at a solution

    [PLAIN]http://img826.imageshack.us/img826/1492/myatteptm.jpg [Broken]

    NOTE - it said as an aside it was meant to be 8kg and not 18!
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Aug 11, 2010 #2

    Doc Al

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    Staff: Mentor

    Redo the arithmetic in the last step, when solving for v.
     
  4. Aug 11, 2010 #3
    thanks! does the rest of it look ok?
     
  5. Aug 11, 2010 #4

    Doc Al

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    Staff: Mentor

    Yes, it looks fine. My only suggestion is that you be careful about rounding off too soon.
     
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