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Elastic Collision between ball and pivoted rod

  1. Dec 20, 2014 #1
    1. The problem statement, all variables and given/known data
    This is a solved problem--
    http://web.mit.edu/8.01t/www/materials/InClass/IC_Sol_W13D1-10.pdf

    2. Relevant equations


    3. The attempt at a solution
    In the solution, they conserve energy and angular momentum. Can I conserve linear momentum? Also, can I use coefficient of restitution (as e=1)?
     
  2. jcsd
  3. Dec 20, 2014 #2
    I think we can not conserve linear momentum because if we consider rod and ball as a system then an external force acts on it(at P). But we can use e=1 here.
     
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