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Homework Help: Collision calculation help

  1. Aug 11, 2004 #1
    I have a problem as follows:

    A rugby player, mass 120 kg is running due south at 6 m/s. He is tacked by an opponent, mass 90 kg, due east at 8 m/s. Calculate the combined speed of the joined players immediately after the tacke.

    I assume that

    m1*u1 + m2*u2 = (m1+m2)V

    is it right ?


  2. jcsd
  3. Aug 11, 2004 #2


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    Dearly Missed

    True enough, but remember:
    1.There's no way but to treat the velocities as vectors here!
    2. You are asked for the SPEED, rather than the VELOCITY, so your final answer should be a scalar(number), not a vector
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