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Momentum in 2-D

  1. Oct 29, 2009 #1
    1. The problem statement, all variables and given/known data
    A 850 kg car is traveling west at 25.0 m/s when it collides with a 1050 kg car that was initially traveling north at 10.5 m/s. The cars lock together, and eventually skid to a stop.
    What is the velocity of the cars immediately after the collision?

    2. Relevant equations
    pi=pix i + piy j + piz k


    3. The attempt at a solution
    I got an answer but I'm not sure if it is correct. I just need someone to verify if what I did is correct.
    Here's what I did:
    I found pi using the equation above and then took the magnitude of that to find pf as shown below:

    (-(850 kg)(25.0 m/s) i)2 + ((1050 kg)(10.5 m/s) j)2=pf2

    I then took the pf value and set that equal to the total mass times the velocity:

    2.39 x 104 kg*m/s=(850 kg + 1050 kg)v

    I then solved for v to get the following:

    v=12.6 m/s
     
  2. jcsd
  3. Oct 29, 2009 #2

    rl.bhat

    User Avatar
    Homework Helper

    Your answer is correct.
     
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