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Given height find how fast its moving

  1. Oct 5, 2008 #1
    given height find how fast its moving....

    1. The problem statement, all variables and given/known data

    Seagulls are often observed dropping clams and other shellfish from a height to the rocks below, as a means of opening the shells. If a seagull drops a shell from rest at a height of 6 m, how fast is the shell moving when it hits the rocks?
    find m/s

    3. The attempt at a solution

    6m/9.8=58.8 wrong
    i cant figure it out help please
     
  2. jcsd
  3. Oct 5, 2008 #2
    Re: given height find how fast its moving....

    What equation did you attempt to use?

    Are you not aware of the kinematics equations?
     
  4. Oct 5, 2008 #3
    Re: given height find how fast its moving....

    I am using motion eqautions, Vf=Vi+at
     
  5. Oct 5, 2008 #4
    Re: given height find how fast its moving....

    But you're not given the time. You're only given the initial velocity, the distance, and you know the acceleration due to gravity. That is not the correct formula to use. What other formulas are there for kinematics?
     
  6. Oct 5, 2008 #5
    Re: given height find how fast its moving....

    VF2=Vi2+2a+(delta)

    or

    Xf=Xi=Vit=.5at2
     
  7. Oct 5, 2008 #6
    Re: given height find how fast its moving....

    The first equation is correct.

    Vf^2 = Vo^2 + 2ad

    You have to use the equation that has the terms that you're given. You're not given time and so you can't use any other equation in this situation. Now are you able to solve the problem?
     
  8. Oct 5, 2008 #7
    Re: given height find how fast its moving....

    Yes if figured it out thanks alot
    the answer was 10.844 m/s
     
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