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Homework Help: Momentum in an Explosion

  1. Nov 29, 2008 #1
    1. The problem statement, all variables and given/known data
    A giant "egg" explodes as part of a fireworks display. The egg is at rest before the explosion, and after the explosion, it breaks into two pieces, with the masses indicated in the diagram, traveling in opposite directions.
    Part A
    What is the momentum PA,i of piece A before the explosion?(initial momentum)
    Part B
    During the explosion, is the force of piece A on piece B greater than, less than, or equal to the force of piece B on piece A?

    2. Relevant equations
    law of conservation of momentum

    3. The attempt at a solution
    part a
    i think as it says in the question that the egg is at rest so wont the initial momentum be zero but a bit hesitant ...cant be that easy....
    part b
    equal forces according to newtons law ?
  2. jcsd
  3. Nov 29, 2008 #2
    That's right! just set it up lie that and remmber since they go in opposite directions, one is negative so

    0 = m1v1-m2v2
  4. Nov 29, 2008 #3
    THANKS aimslin 22 for givin positive resp
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