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Homework Help: If raindrops fell with no air drag how long would it take?

  1. Sep 18, 2009 #1
    1. The problem statement, all variables and given/known data

    If there were no air drag, how fast would drops fall from a cloud 1.6 kilometer above the Earth's surface?

    2. Relevant equations
    am i heading in the right direction if not what am i doing wrong?

    3. The attempt at a solution

    i tried converting to m first then i divided both by 2 getting

    2d=at^2 and then i divided both by the acceleration which i assumed to be gravity (9.8) after that i had 2(1600)/9.8=t^2 and to get rid of the exponet i rooted both sides and got 326.5
  2. jcsd
  3. Sep 18, 2009 #2

    d = 0.5gt^2 + v_0*t
    v_0 = 0
    1.6km = 0.5*9.81*t^2
    t = 326..
  4. Sep 18, 2009 #3
    when i ented the answer the web assignment said it was wrong though and now im kind of confused as to what i did wrong.
  5. Sep 18, 2009 #4
    Because it is sqrt(326). I just recognized that. I also forgot to take square root
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