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Homework Help: Initial momentum of the system

  1. Oct 25, 2007 #1
    [SOLVED] Conservation of Momentum

    1. The problem statement, all variables and given/known data
    Two blocks with masses m1 = 2.6 kg and m2 = 3.6 kg are at rest on a frictionless surface with a compressed spring between them. The spring is initially compressed by 60.0 cm and has negligible mass. When both blocks are released simultaneously and the spring has dropped to the surface, m1 is found to have a speed of 3.0 m/s. What is the speed of m2?

    2. Relevant equations

    3. The attempt at a solution
    I am trying to figure out the initial momentum of the system, so do I m1v1=m2v2?
  2. jcsd
  3. Oct 25, 2007 #2
    Why do u have to calculate initial momentum? Isn't it zero!?
    Yes, you may apply conservation of linear momentum, after thinking about all the forces acting on the system.
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