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Homework Help: 1-d acceleration problem

  1. Feb 7, 2010 #1
    Kinematics Question plz help.

    1. The problem statement, all variables and given/known data
    a ball is thrown vertically upward from a window that is 3.6m above the ground. Its initial speed is 2.8m/s . What speed will the ball hit the ground.
    show what formulas were used plz.



    2. Relevant equations
    v2^2=v1^2+2ad


    3. The attempt at a solution

    im wondering, wouldnt the height be different, because it is thrown vertically up?
    so the distance would be different, changing the speed (Vf)?

    I get 8.85m/s when i assume d=3.6m Vo=2.8m/s a=9.8m/s
    wouldnt that be the speed of the object if it were thrown to the ground?
     
    Last edited: Feb 7, 2010
  2. jcsd
  3. Feb 7, 2010 #2
    Re: Kinematics Question plz help.

    anything? can anyone even jsut say whether or not my answer is right?
     
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