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Homework Help: Falling Object problem

  1. Oct 20, 2009 #1
    1. The problem statement, all variables and given/known data

    Stephanie hits a volleyball from a height of 0.8m and gives it an initial velocity of 7.5m/s straight up.?
    a. how high will the volleyball go?
    b. how long will it take the ball to reach its maximum height? (hint:@ max height, v= 0m/s)

    2. Relevant equations

    im not sure but maybe d=vit+1/2 at^2

    3. The attempt at a solution

    tried a lot of things :/
  2. jcsd
  3. Oct 20, 2009 #2


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    d=vit+1/2 at^2 is good, but you also need v = vi + a*t so you can take advantage of that hint about the v being zero at maximum height.
  4. Oct 20, 2009 #3


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    Show your attempts.
  5. Oct 20, 2009 #4
    tyvm!!!! i think you use vf=vi+at to find how high it will go ???
  6. Oct 20, 2009 #5
    i did vf^2= 7.5^2+2(-9.81)(.8)
    im not sure if its how you do this
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