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Impulse in an inelastic collision

  1. Aug 20, 2013 #1
    1. The problem statement, all variables and given/known data
    2 particles travel towards each other at 10ms-1. Particle 1 has a mass of 10kg and particle 2 has a mass of 30kg. It is an inelastic collision.

    Find the magnitude of the Impulse of particle 1 and 2.


    2. Relevant equations
    I=Ft=mv-mu
    m1u1+m2u2=(m1+m2)V

    3. The attempt at a solution
    I'm able to calculate the final velocity of the two particles after the collision when they have joined.
    ((10×10)+(30×10))/(10+30)=10ms-1
    but I cannot now calculate the impulse of any of the particles.
    For example for particle 1:
    mv-mu=(10×10)-(10×10)=0

    Could anyone help?
     
  2. jcsd
  3. Aug 20, 2013 #2

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

    10m/s is not the final velocity. Keep in mind that they are colliding, their motion is not in the same direction.

    Oh, and please don't forget units.
     
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