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Homework Help: Speed of objects

  1. Dec 20, 2009 #1
    1. The problem statement, all variables and given/known data

    A bomb that is originally at rest blows apart into three pieces of equal mass. Two of the
    pieces have velocities (12i + 24j) m/s and (30i - 24j) m/s. What is the speed of the third
    piece?

    2. Relevant equations

    m1v1 + m2v2 + m3v3 = 3mv4 (assuming m is the same)


    3. The attempt at a solution

    Not really sure where to begin. I can find the speed of the 2 objects by finding the k direction, but thats it.
     
  2. jcsd
  3. Dec 20, 2009 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Hint: What's the total momentum of all three pieces?
     
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