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F(t) values graph, why doesn't this make sense?

  1. Oct 10, 2009 #1
    1. The problem statement, all variables and given/known data
    http://img35.imageshack.us/img35/7035/picture18hl.png [Broken]
    http://img195.imageshack.us/img195/7315/picture19dq.png [Broken]



    http://img171.imageshack.us/img171/7427/picture20e.png [Broken]
    http://img16.imageshack.us/img16/8384/picture21v.png [Broken]
    2. Relevant equations



    3. The attempt at a solution
    I don't know why the values for c and e seem wrong to me. Shouldn't acceleration be positive at only t2 and t3? And velocity decreasing at t1, t4, and t5? Am I thinking of this the wrong way or too much like a physics problem?
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Oct 10, 2009 #2

    Mark44

    Staff: Mentor

    Acceleration is positive at t1 and t2, because the velocity is increasing at those points. Notice that at t3, the velocity is decreasing, which makes the acceleration negative at that point.

    Velocity is decreasing at t3, t4, and t5. Not coincidentally, the acceleration is negative at these points.
     
  4. Oct 11, 2009 #3
    It said incorrect...
     
  5. Oct 11, 2009 #4

    Mark44

    Staff: Mentor

    It said incorrect for what?
     
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