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Discussion question from university physics

  1. Jun 23, 2013 #1
    1. The problem statement, all variables and given/known data
    When you drop an object from a certain height, it takes time T to reach the ground with no air resistance. If you dropped it from 3 times that height, how long (in terms of T) would it take to reach to the ground?


    2. Relevant equations

    displacement=V0t+.5g(t)2

    3. The attempt at a solution

    i got T=sqrt2 and T=sqrt6 but now i'm stuck on how to set up the next proportion. Also would like to see how you started this one.
     
  2. jcsd
  3. Jun 23, 2013 #2

    PeterO

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    Homework Helper

    Perhaps you could consider the case of dropping a mass , on Earth where g = 9.8, from a height of 1 m and 3 m then 8 m and 24 m and see if that gives you any hints.
     
  4. Jun 23, 2013 #3
    thank you! I think the answer is sqrt3
     
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