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How do you find impulse?

  1. Nov 24, 2008 #1
    1. The problem statement, all variables and given/known data

    Before a collision, a 26 kg object is moving at +10 m/s. Find the impulse that acted on the object if, after the collision, it moved at the following velocities.

    a) +8.0 m/s
    b) -8.0 m/s


    2. Relevant equations

    Impulse = change in momentum
    = mass * change in velocity
    = m * (vf - vi)

    3. The attempt at a solution

    a) = 26 (+10 m/s - +8.0 m/s), impulse = 52?
    b) = 26 (+10 m/s - -8.0 m/s), impulse = 468?
     
  2. jcsd
  3. Nov 24, 2008 #2

    alphysicist

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    Homework Helper

    Hi itsmarasilly,


    If you compare these to the last equation in your "Relevant equations" section, it looks like you have the initial and final velocities switched.
     
  4. Nov 24, 2008 #3
    oh okay, got it. thanks! :)
     
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