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Help with calculating Speed using distance and time

  1. Sep 13, 2014 #1
    Calculating speed of collision

    Here is the question

    Screen Shot 2014-09-13 at 5.57.55 PM.png


    So my question is, which formula do I use? Im just really confused. Do I use a kinetic energy one? or?
     
    Last edited: Sep 13, 2014
  2. jcsd
  3. Sep 13, 2014 #2

    ShayanJ

    User Avatar
    Gold Member

    You should use conservation of momentum.
     
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