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Homework Help: One-Dimensional Gravitational Motion

  1. Jun 4, 2007 #1
    1. The problem statement, all variables and given/known data
    It takes 2.70 s for a small ball with a mass of 0.050 kg released from rest from a tall building to reach the ground. Calculate the height from which the ball is released.


    2. Relevant equations
    F=MA
    Vo=h/t - .5at


    3. The attempt at a solution

    I plugged in all the knowns into the above equation but was still left with an unknown initial V and an unknown height. unsure how to proceed.
     
  2. jcsd
  3. Jun 4, 2007 #2
    Well, the problem says the ball was released from rest. What does this imply about the initial V?
     
  4. Jun 4, 2007 #3
    o ok it is zero, is the rest of my equation correct?
     
    Last edited: Jun 5, 2007
  5. Jun 5, 2007 #4
    so ive got:
    0= h/2.7 +13.23
     
  6. Jun 5, 2007 #5
    It looks right to me.
     
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