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How high is this building?

  1. Nov 8, 2013 #1
    1. The problem statement, all variables and given/known data
    A stone dropped from the top of a building hits the ground in 2.9 s. How high is the building?

    a=9.8 m/s^2
    yinitial=0
    vinital=0
    y=?

    2. Relevant equations
    y=1/2at^2



    3. The attempt at a solution
    y=1/2at^2

    Plugging in what I know:
    y=1/2(9.8m/s^2)(2.9s)^2
    Simplifying:y=1/2(82.4) m
    Answer: y=41.2 m

    Is this correct? Thanks in advance for confirming! :-)
     
  2. jcsd
  3. Nov 8, 2013 #2
    Looks correct to me. That is, assuming it is dropped from rest. It doesn't explicitly say, but I think it this case it is a safe assumption.
     
  4. Nov 8, 2013 #3
    Thank you! I believe it is, my physics teacher usually assumes so.
     
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