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Homework Help: How high can a fish jump after breaking through the surface at a speed of 2.5 m/s?

  1. Sep 26, 2008 #1
    1. The problem statement, all variables and given/known data
    If a salmon swims straight upward in the water fast enough to break through the surface at a speed of 2.5 meters per second, how high can it jump above water?


    2. Relevant equations
    i dont know, because all i know is speed.



    3. The attempt at a solution
    is acceleration 9.81 in this? i dont know how to figure it out : [
     
  2. jcsd
  3. Sep 26, 2008 #2
    Re: how high can a fish jump after breaking through the surface at a speed of 2.5 m/s

    the formulas you need are:

    V final = V initial + A(t)

    and

    X final = X initial + V initial (t) + 1/2A(t^2)

    where x is distance, v is velocity and a is acceleration (yes, 9.81 m/s^2)

    write'em down, I'm sure they're in your book, and should get you started on all your problems.
     
  4. Sep 26, 2008 #3

    Borek

    User Avatar

    Staff: Mentor

    Re: how high can a fish jump after breaking through the surface at a speed of 2.5 m/s

    You may as well approach the question from the conservation of energy side. Kinetic energy gest converted into potential during flight.
     
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