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Homework Help: Magnitude of acceleration

  1. Oct 15, 2008 #1
    1. The problem statement, all variables and given/known data
    An object moving along a straight line, at constant acceleration covers two equal, consecutive, 13 m long segments, the first one in t 1 = 1.2 s and the second one in t 2 = 2.2 s . What was the magnitude of acceleration? (in m/s2) ,
    And what is the speed of the object (m/s) at the beginning of the first segment?



    2. Relevant equations
    V=(D/T)
    if D/2 at V1, D/2 at V2, then
    Vav = (2V1.V2)/V1+V2
    acceleration = velocity/time


    3. The attempt at a solution
    V1 = 13/1.2 = 10.83 m/s
    V2 = 13/2.2 = 5.91m/s
    Vav = (2x10.83 x 5.91)/10.83 + 5.91 = 7.6
    acceleration = 7.6 / 3.4
    = 2.24 m/s2
     
  2. jcsd
  3. Oct 15, 2008 #2
    i have a similar problem...anyone help?
     
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