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Linear impulse

  1. Oct 14, 2016 #1
    1. The problem statement, all variables and given/known data
    upload_2016-10-14_18-1-0.png

    2. Relevant equations
    ∫ F dt = mv

    3. The attempt at a solution
    I have
    ∫ T -mg dt
    = ∫ 100+2t2 - mg dt
    = ∫ 100-9000*9.81 +2t2 dt

    but then I got negative impulse ...??
     
  2. jcsd
  3. Oct 15, 2016 #2

    haruspex

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    ... where the units are ...?
     
  4. Oct 18, 2016 #3
    Oh I see 100+ 2t^2 in KN... mg should also in kN
     
  5. Oct 18, 2016 #4

    haruspex

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    Whatever makes all the units consistent.
     
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