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Simple projectile question

  1. Oct 14, 2012 #1
    1. The problem statement, all variables and given/known data
    An object is launched and it's velocity upon landing is 12 m/s [13 degrees below the horizontal].
    If I assume down is positive and up is negative, what would my given for vf look like?


    2. Relevant equations
    in the x direction: vfcostheta
    in the y direction: vfsintheta


    3. The attempt at a solution
    vf=-12m/s cos -13

    Is it negative 13 b/c it's below the horizontal?
     
  2. jcsd
  3. Oct 14, 2012 #2
    Try to draw a diagram first. I dont really understand what your question is.
     
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