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Homework Help: Laplace transform integral

  1. Mar 24, 2012 #1
    1. The problem statement, all variables and given/known data
    I've attached the multiple choice question

    2. Relevant equations

    3. The attempt at a solution

    I inversed laplaced the problem and i get an answer of 3 H(t-3) sin(9(t-3)) which isn't any of the options so I chose F but that was wrong. So far i've confidentally eliminated B,C and now F. A D and E remain. I tried using the convolution integral that yields me a different answer as well so im really confused here

    Attached Files:

  2. jcsd
  3. Mar 24, 2012 #2
    okay the answer is E. I already have 3 H(t-3) sin(9(t-3)). F(s) is H(t-3) and G(s) = sin(9(t-3)) but then when i write it as a convolution integral, shouldn't the t's be replaced with u instead of replacing the 3 as it is shown.
  4. Mar 24, 2012 #3
    it's cool i got it.
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