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Homework Help: Free fall of stones

  1. Oct 3, 2007 #1
    1. The problem statement, all variables and given/known data

    A stone is dropped from the roof of a high building. A second stone is dropped 1.50 s later. How far apart are the stones when the second one has reached a speed of 11.0 m/s?

    2. Relevant equations

    kinematics

    3. The attempt at a solution

    i need help setting up the problem i dont know how
     
  2. jcsd
  3. Oct 3, 2007 #2

    cristo

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    Well, work out the displacement of the first stone when it reaches 11m/s, then the displacement of the second stone at this time.
     
  4. Oct 3, 2007 #3
    i got the displacement of the first one as 6.17 m how do i get the second one?
     
  5. Oct 3, 2007 #4

    cristo

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    There's no way I can tell you you're right or not if I don't see your work! Try calculating the time when the stone reaches 11m/s. Then you can perhaps find the displacement of the second stone at this time.
     
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