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Kinematics - Vector DE

  1. May 5, 2014 #1

    FeDeX_LaTeX

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    Gold Member

    Kinematics -- Vector DE

    1. The problem statement, all variables and given/known data
    f516dt.jpg

    3. The attempt at a solution
    Here's their solution.

    5wca2r.jpg

    I'm stuck on (b). The first and second lines are fine. But how do they get from the second line to the third line? And then in the fourth line, why are they integrating from u^2 to v^2?

    EDIT: Sorry for the image size.
     
  2. jcsd
  3. May 5, 2014 #2
    They make the substitution v2 = x.

    Chet
     
  4. May 5, 2014 #3

    FeDeX_LaTeX

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    Gold Member

    That's it?! I thought x denoted position (as a function of time)! Was losing my mind over this. Thanks.
     
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