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Homework Help: Finding particle one's final velocity in inelastic collision

  1. Nov 19, 2008 #1
    1. The problem statement, all variables and given/known data
    particle 1 with mass 6.7 kg going 7.3 m/s collides inelastically with a particle of mass 4 kg at rest. find the final velocity of particle one after the collision.

    2. Relevant equations
    Ki = Kf
    but, mechanical energy is not conserved in an inelastic collision.
    pi = pf (initial momentum = final momentum): mvi = mvf

    3. The attempt at a solution
    I decided to use the conservation of momentum because it is always conserved (at least for the problems I am dealing with).

    m1vi1 + m2vi2 = (m1 + m2)vf
    vi2 = 0
    i have both particles at the same final velocity because they buckle together after the collision, therefore they share the same velocity.

    vf = m1vi1/(m1 + m2) = (6.7*7.3)/(6.7 + 4) = 4.57 m/s

    Is this correct?
  2. jcsd
  3. Nov 19, 2008 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Looks good!
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