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Homework Help: Brave Fish launching himself in a cannon

  1. Nov 27, 2011 #1
    1. The problem statement, all variables and given/known data
    The brave fish launches himself from a 6 cm cannon straight up in the air. When he leaves the cannon he is traveling at 6.5 m/s. assume constant acc while in the cannon.
    How long was the fish in the cannon?



    2. Relevant equations
    v^2=Vo^2+2ax
    X= Xo + Vot + 1/2at^2
    X=height
    Xo=initial height
    Vo=initial velocity
    t=time



    3. The attempt at a solution
    6.5^2=0^2+2a(.06)
    a=352.08m/s^2
    352.08=u-9.8 (u=up acc)
    u=361.88m/s^2

    x=1/2at^2
    .06=1/2(361.88)t^2
    t=.02sec
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Nov 27, 2011 #2

    PhanthomJay

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    Science Advisor
    Homework Helper
    Gold Member

    Yes, but do not add 'g' to the acceleration. You can get the same result more easily by using [itex]x = [(v_o + v_f)/2]t[/itex].
     
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