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Make an equation relative

  1. Aug 5, 2015 #1
    1. The problem statement, all variables and given/known data
    Screenshot_2015-08-05-16-27-07-1.png
    2. Relevant equations


    3. The attempt at a solution
    This is actually part of the solution that was provided by the professor. However, I do not fathom two portions of the steps taken (written in orange). Part of the solution is in the picture below.
    Screenshot_2015-08-05-16-37-12-1.png

    Please help
     
  2. jcsd
  3. Aug 5, 2015 #2

    mfb

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    Why do you expect a division by b? That would get the units wrong.
    The added constant could come from a wheel that moves (rolls on the floor). If this is the horizontal component, it does not matter anyway.
     
  4. Aug 5, 2015 #3

    haruspex

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    Before differentiation there was a factor b. The 1/b that came as a result of the differentiation has cancelled that.
     
  5. Aug 5, 2015 #4
    Gosh, I didn't notice that haha
    . Thanks
     
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