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Homework Help: Collisions in 2 diemensions

  1. Dec 16, 2007 #1
    1. The problem statement, all variables and given/known data
    An object explodes into 3 equal masses. One mass moves east at a velocity of
    15.0 m/s . If a second mass moves at a velocity of 10.0 m/s 45degrees south of east.
    What is the velocity of the 3rd object

    2. Relevant equations
    I know m1 = m2 = m3 therefore we have just M

    3. The attempt at a solution

    I have no idea where to start ..... can anyone help me get started at least??
  2. jcsd
  3. Dec 16, 2007 #2
    Momentum has to be conserved from the Center of mass but you were never given an initial velocity I don't think you can solve it?

    EDIT: Did the object explode form rest?
  4. Dec 16, 2007 #3
    yes it exploded from rest, and my teacher said in this case there is no friction .........
  5. Dec 16, 2007 #4
    Momentum has to be conserved for the center of mass of the individual particles, which equaled 0 before the explosion, can you see where to go form here?
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