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Homework Help: Velocity before collision

  1. Jan 21, 2012 #1
    A car with a mass of 1007 kg is moving 36 m/s, strikes a 2499 kg car at rest. if the two cars stick together, with what speed do they move?

    I tried using the equation mass of object 1st car*(initial velocity of car 1 + initial velocticy
    of car 2) the divide by the mass of car 2. i dont know what to do plz help :confused:
  2. jcsd
  3. Jan 21, 2012 #2
    sorry i wrote the wrong title
  4. Jan 21, 2012 #3


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    welcome to pf!

    hi jmoser! welcome to pf! :wink:

    (never make the first reply to your own question :redface: … it removes the question from the no-replies list! … if necessary, use the EDIT button instead :wink:)
    just take it slowly …

    i] what is total momentum before?

    ii] what is total momentum after? :smile:
  5. Jan 22, 2012 #4
    ok thanks ill remember that :) ok the total momentum before is 36252 all i did was mass times velocity and add both momentum for both and that is what i got and after the collision it is the same right?
  6. Jan 22, 2012 #5


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    hi jmoser! :wink:
    that's right! :smile:
    your english is difficult to understand :confused:

    yes, the total momentum after is also 36252 …

    so what is the speed? :smile:
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