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Homework Help: Quick Question

  1. Dec 11, 2016 #1
    A 4 kg block, traveling at 6 m/s on a horizontal surface collides with an identical 4 kg block that is motionless in a perfectly inelastic collision. The combined masses then collide head on with a third 4 kg mass which is at rest. If the larger mass continues with a velocity of 1 m/s, what is the velocity of the third 4 kg mass if the final collision was elastic?

    A) 1 m/s
    B) 2 m/s
    C) 3 m/s
    D) 4 m/s
    E) -3 m/s
  2. jcsd
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