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Homework Help: Initial Velocity

  1. May 24, 2010 #1
    1. The problem statement, all variables and given/known data
    Find the initial velocity of a ball with the time=2.58 seconds and distance of 9.87 meters

    2. Relevant equations
    vi=v-at


    3. The attempt at a solution
    I don't understand how to find the acceleration with just time and distance is it just 9.8 m^3/second?
     
  2. jcsd
  3. May 24, 2010 #2
    I can't gather from the problem that the ball experiences any acceleration. The really basic equation that comes to mind is: x=xo+vot+½at2. Give that a try.

    In the case that the ball is falling vertically, a=10ms-² instead of zero (9.81ms-² if you wanted to be more precise).
     
  4. May 25, 2010 #3

    Redbelly98

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    Welcome to Physics Forums :smile:
    How exactly is the problem worded? Is there any indication that the ball is falling?
     
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