1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: 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

    User Avatar
    Gold Member

    From the information given the answer should be 2.5 v.
  4. Apr 8, 2012 #3
    Thank you
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook