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Homework Help: 2D Elastic Collision Using Conservation of Momentum

  1. Jan 31, 2016 #1
    1. The problem statement, all variables and given/known data
    Two objects collide and bounce off one another. After the collision, object m1 = 2.74 kg moves off at 12.8 m/s at a heading of 295 degrees. Object m2 = 2.28 kg moves off at 12.8 m/s at a heading of 241 degrees. Initially, m2 was traveling at 11.1 m/s at a heading of 334 degrees. What must have been the initial velocity of m1? Give the speed for your first answer and the compass heading for your second answer. (remember, the CAPA abbreviation for degrees is deg)
    2. Relevant equations
    P=mv and Pi = Pf and m1v1 + m2v2 = m1v1' + m2v2'

    3. The attempt at a solution
    I entered into LONCAPA "18.69 m/s" and "244.47 deg" and I get incorrect.
    Here are some photos of my work:
    I have spent like an hour on this question alone. Please Help!
  2. jcsd
  3. Jan 31, 2016 #2


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    Homework Helper
    Gold Member
    2017 Award

    Hello and welcome to PF!

    Your work looks correct to me. I get the same answer as you.
    Of course, you should double check that you have not misread any of the numbers in the original problem statement.
  4. Jan 31, 2016 #3


    User Avatar
    2017 Award

    Staff: Mentor

    I get the same result as well.
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