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Homework Help: Collision help

  1. Mar 3, 2005 #1
    could someone help me with this problem?

    A 139 kg tackler moving at 2.53 m/s meets head-on (and tackles) a 87.4 kg halfback moving at 5.14 m/s. What will be their mutual speed immediately after the collision?

    Oh right. Here's what I've tried doing but no luck.

    m1 = 139kg V1 = 2.53 m/s
    m2 = 87.4 kg V2 = 5.14 m/s

    m1v1+msv2 = Vf(mi+m2)

    Vf = (m1v1+m2v2)/(m1+m2)
    Last edited: Mar 3, 2005
  2. jcsd
  3. Mar 3, 2005 #2
    Nevermind I got it. Seems I needed to set one of the velocities as negative since it was an inelastic collision.
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