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Energy transfer question (Use PE=KE or SUVAT ?)

  1. May 30, 2015 #1
    1. The problem statement, all variables and given/known data
    Object falls from a tree which is 3m above the ground, what is its velocity when it hits the ground ?

    2. Relevant equations
    mgΔh=1/2mv2
    or
    s=vt-1/2at2

    3. The attempt at a solution
    Using the idea of PE=KE, as the masses cancel out I get an answer of V=7.66ms-1
    However I thought that this question can also be done with a suvat equation, I use the same condition which is used for KE [That U=0].

    When attempting with suvat I get an answer of 17.15ms-1 why is that ?
     
  2. jcsd
  3. May 30, 2015 #2

    gneill

    User Avatar

    Staff: Mentor

    Hard to tell if you don't show your work!
     
  4. May 30, 2015 #3
    Sorry, I just wanted to know if it was actually possible to be done using suvat ?
     
  5. May 30, 2015 #4

    gneill

    User Avatar

    Staff: Mentor

    Sure. And the answer should be the same :smile:
     
  6. May 30, 2015 #5
    I just tried it again and looked like I forgot how to use my calculator o0), but I did get the same.

    Thanks for confirming anyways :)
     
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