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Homework Help: Momentum and speed

  1. Nov 9, 2008 #1
    1. The problem statement, all variables and given/known data
    A 1500kg car has the same momentum as a 2500kg truck moving at 15 m/s.
    How fast is the car moving?
    A. 15 m/s
    B. 25 m/s
    C. 35 m/s
    D. 40 m/s
    E. 50 m/s

    2. Relevant equations
    p = mv


    3. The attempt at a solution
    Truck = (2500kg)(15m/s) = 37500
    Car = v=p/m = 37500/1500kg = 25m/s

    This is what I answered but it says it wrong.
    Any help would be appreciated.
    Kevin
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Nov 9, 2008 #2
    You're not wrong unless you're leaving out some information.
     
  4. Nov 9, 2008 #3
    I've got everything. We took a test and get to retake it. I missed this one by putting 25 m/s. I think it's right. I emailed my instructor.
    Thanks,
    Kevin
     
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