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Homework Help: Inelastic collision and velocity of car

  1. Oct 23, 2011 #1
    1. The problem statement, all variables and given/known data

    2000 kg car traveling west at 75 km/h and a motorcycle traveling south at 108 km/h weighing 1000kg. assuming the collision is completely inelastic, what is the velocity of the vehicles after the collision.

    2. Relevant equations

    I know that the Pi, system = Pf, system.

    3. The attempt at a solution
    I am just confused of where to start. Any pointers into the correct direction would be greatly appreciated.
  2. jcsd
  3. Oct 23, 2011 #2


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    Homework Helper

    "Completely inelastic" means they stick together.
    Momentum is conserved in both the north/south direction and the east/west direction. You must write
    momentum before = momentum after
    for both directions, put in an mv for each moving object before and after.
    Put in the known numbers and you will be able to work out the velocity after the collision in each direction.
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