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Momentum/Impulse [Final Velocity]

  1. Jan 7, 2009 #1
    1. The problem statement, all variables and given/known data
    "A truck weighs four times as much as a car, If the truck coasts into the car at 12 km/h and they stick together, what is their final velocity."


    2. Relevant equations
    Change in momentum a = change in momentum b
    OR
    m1v1 = m2v2
    OR
    (delta)P system = 0


    3. The attempt at a solution
    I HAVE NO IDEA. SRSLY.
     
  2. jcsd
  3. Jan 7, 2009 #2

    Hootenanny

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    Welcome to Physics forums.

    As you have correctly surmised, momentum is conserved in this case (since there are no net external forces acting). All three of your relevant equations are equivalent, so how about trying to apply one of them to this problem?
     
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