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Homework Help: Perfect inelastic collision

  1. Oct 15, 2009 #1
    1. The problem statement, all variables and given/known data

    Two trucks with same masses are moving toward each other along a straight line with speeds of 50 mi/hr and 60 mi/hr. What is the speed of the combined trucks after completely inelastic collision?

    2. Relevant equations
    P[tex]_{}1[/tex]+P[tex]_{}2[/tex]= (2M) V[tex]_{}f[/tex]

    3. The attempt at a solution

    Given the trucks we can assign a random mass. To make it easy Mass = 1. So 60+50= 2V[tex]_{}f[/tex] Solve it and you get 55 mi/hr. Is this correct?
    Last edited: Oct 15, 2009
  2. jcsd
  3. Oct 15, 2009 #2
    Think of the trucks as two vectors going the opposite direction. One with a magnitude of 50 mph and one with a magnitude of 60 mph. Take the sum of these two vectors.
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