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Homework Help: Finding intial momentum

  1. Mar 19, 2014 #1
    1. The problem statement, all variables and given/known data
    You are riding in a car that crashes into a solid wall. The car comes to a complete stop without bouncing back. The car has a mass of 1500 kg and has a speed of 30 m/s before the crash.

    What is the car’s initial momentum? What is your initial momentum? (Recall that the weight
    of one kilogram is 2.2 lbs) What is the change in the momentum of the car? What is the
    change in your momentum?

    2. Relevant equations

    3. The attempt at a solution

    CarI= (1500kg) X (30m/s)= 45000kg m/s
    YouI=(Mass) X (30 m/s)

    Car change= (1500kg) X (-30m/s)= -45000kg m/s
    You change= (Mass) X (-30m/s)
  2. jcsd
  3. Mar 19, 2014 #2


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    Yes...where your mass in kg is your weight in pounds divided by 2.2.
    I guess that is what the problem is asking....
  4. Mar 19, 2014 #3


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    That all looks right. Is that all you wanted to know?
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