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Homework Help: Football question (kinematics)

  1. Nov 19, 2011 #1
    1. The problem statement, all variables and given/known data

    A foot ball is kicked from a height of 2.0 m to a maximum height of 8.0m. Calculate the football's initial velocity and the time taken to reach the maximum height.

    2. Relevant equations

    3. The attempt at a solution

    I could solve it if i was given time, acceleration or vf or v i but only two variables are given and that too of the same. Can someone help me. I could assume vi is 0, but i have no idea how to approach this
    Last edited: Nov 19, 2011
  2. jcsd
  3. Nov 19, 2011 #2
    If this is a one-dimensional free-fall problem , then this is how you solve it:

    Your Δx is 6
    Final velocity is given to you: Since it says maximum height, at that height your final velocity will be 0.
    Most importantly, your acceleration will be -9.8 m/s^2 since once the football is in the air, gravity is the only force acting on it.

    With those given data, just go to your big four, and voila! :)
  4. Nov 19, 2011 #3
    Ahh i see, yea now it makes sense. Thanks a lot!
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