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Homework Help: Ball thrown down simplify for time. HELP!

  1. Oct 16, 2008 #1
    1. The problem statement, all variables and given/known data
    A student throws a ball downward at a velocity of 8.0m/s from a height of 25m. How long until it hits the ground? What is the velocity of the ball as it hits the ground.

    2. Relevant equations
    What is thee formula when simplifying for T(time)?

    3. The attempt at a solution
    When using the formula d=ViT + 1/2a*d I get 3.4s, but the answer is 1.6s.
    Last edited: Oct 16, 2008
  2. jcsd
  3. Oct 16, 2008 #2


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    Homework Helper

    Welcome to PF.

    Maybe think more in terms of

    x = Vi*t + 1/2*g*t2
  4. Oct 16, 2008 #3
    now im still getig high answers... how do i simplify for t?
  5. Oct 17, 2008 #4


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    Homework Helper

    Didn't you get a quadratic equation? Use the quadratic formula. I don't think one of the solutions is too large.
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