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Conservation of momentum

  1. Apr 8, 2012 #1
    1. The problem statement, all variables and given/known data
    Two identical blocks of the same mass travel at velocities of 3v and 2v on a smooth surface as shown (same direction).
    Two blocks move together after collision. What is their common velocity?

    2. Relevant equations
    Conservation of momentum

    3. The attempt at a solution
    Let v' be the common velocity.

    3mv+2mv = 2mv'
    v'= 2.5v

    Therefore the veloctiy is 2.5v. Answer given is 1.5v.
     
  2. jcsd
  3. Apr 8, 2012 #2

    Filip Larsen

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    Gold Member

    From the information given the answer should be 2.5 v.
     
  4. Apr 8, 2012 #3
    Thank you
     
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