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Acceleration of free falling object on planet X

  1. Nov 21, 2009 #1
    1. The problem statement, all variables and given/known data
    While on planet X, an object is thrown vertically upward with an initial velocity of 5m/s. If this object returns to the point of release in 3s, what is the acceleration of a free falling object on this planet?


    2. Relevant equations
    a=vf-vi/t


    3. The attempt at a solution
    0-5/3
    = -1.6m/s^2

    The answer is -3.3m/s^2 in the book...i don't understand how they arrived at that?
     
  2. jcsd
  3. Nov 21, 2009 #2

    rl.bhat

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    Homework Helper

    Hi 1irishman, welcome to PF.
    vf is zero when the object reaches the maximum height.
    What is the time taken by the object to reach that point?
     
  4. Nov 21, 2009 #3
    1.5s
     
  5. Nov 21, 2009 #4
    thank you rl...i see now.
     
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