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Acceleration of water drops problem

  1. Apr 19, 2009 #1
    1. The problem statement, all variables and given/known data

    If the effects of air acting on falling raindrops are ignored, then we can treat raindrops as freely falling objects. Rain clouds are typically a few hundred feet up in the sky. Estimate the speed which raindrops would strike the ground if they were freely falling objects.

    2. Relevant equations

    vf^2=vo^2+2as
    vf-TARGET
    v0- 0
    s- 200
    a- -9.8

    3. The attempt at a solution
    Ok I know the answer, but I don't understand something. What I did was put all my knowns into the equation. Then this is what it looks like.
    vf^2= -3920
    That is obviously unreal. Then I see that there is a problem with the acceleration. WHY? I thought acceleration of freely falling objects was -9.8.
     
  2. jcsd
  3. Apr 19, 2009 #2
    Re: What

    Oh and by the way this is not homework. My goal is to make the iPHO in my highschool years. This problem is from University Physics. Which book do you pros recommend to prepare for olympiad problems? University Physics or Fundamental Physics or others?
     
  4. Apr 19, 2009 #3

    Redbelly98

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    Re: What

    s and a are both negative here.
     
  5. Apr 19, 2009 #4
    Re: What

    If I'm not mistaken, the acceleration of freely falling objects near the surface of the earth is 9.8 m/s2, so a would be 9.8, try plugging that into the equation. :smile:
     
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