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Homework Help: Free-fall kinematics on a plane: Displacement from Window to Ground?

  1. Oct 14, 2012 #1
    1. The problem statement, all variables and given/known data
    A ball is thrown vertically upward from a window at 10m/s. It hits the ground 5.0 seconds later. What is the height of the window from the ground?

    Vi = 10 m/s
    Vf = 0
    Δt = 5.0 m/s
    [tex]Δa = -9.8 m/s^2 [/tex]

    Δd(w-g) = ?

    2. Relevant equations

    Δd = Vi(Δt) + [itex]Δa(Δt)^2[/itex]

    And the other four "kinematic equations"

    3. The attempt at a solution

    Total displacement:

    [tex]Δd = ((vi + vf)/2)(Δt)[/tex]

    = (10/2)(5)
    = 25 m

    Not sure where to go from here and if I'm on the right track. Your help is greatly appreciated!

    P.S. I apologize for the terrible formatting. I'll get it soon enough!
  2. jcsd
  3. Oct 14, 2012 #2
    Question has been resolved outside of the forum. Admin, feel free to delete this thread.
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