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Apply conservation of momentum to the collision

  1. Nov 28, 2007 #1


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    Gold Member

    1. The problem statement, all variables and given/known data

    2 automobiles of equal mass approach an intersection. One vehicle is traveling with a velocity of 13.0m/s toward east and other is traveling north with a speed of [tex] v_2i [/tex]. The vehicles collide at the intersection become stuck together and leave parallel skid lines at an angle of 55.0 deg north of east. Speed limit for both cars is 35mi/h and the driver of th northward moving vehicle claims he was within speed limit when it occured. Is he telling truth?

    2. Relevant equations

    3. The attempt at a solution

    I don't have the masses so how do I do this problem??

    I don't have the v2 so I assume I could work with 35mph speed as the initial speed of the other vehicle but other than that I'm not sure what to do... and I don't have final vf after collison

    35mph=> 15.646m/s

    Last edited: Nov 28, 2007
  2. jcsd
  3. Nov 28, 2007 #2

    Doc Al

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    Staff: Mentor

    Call the mass of each car "m". You won't need the actual value.

    Apply conservation of momentum to the collision. Set up two equations, one for the x-components (East) and one for the y-components (North). Call the final speed vf.

    You should be able to solve for v2.
  4. Nov 28, 2007 #3


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    Gold Member

    Thank You Doc Al

    I got it.
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