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!

Collision of billiard balls

  1. Mar 20, 2010 #1
    1. The problem statement, all variables and given/known data

    Two billiard balls, one heading north at 15.0 m/s and a second heading south at 10.0 m/s, collide head-on. Take the collision to be perfectly elastic and choose the positive direction north.

    What is the post-impact speed of the first ball
    Answer: m/s

    What is the post-impact speed of the second ball?
    Answer: m/s

    2. Relevant equations

    3. The attempt at a solution

    Don't even know where to start.
  2. jcsd
  3. Mar 20, 2010 #2
    You start by applying conservation of momentum and conservation of kinetic energy.
  4. Mar 20, 2010 #3
    But don't i need the mass in order to do that?
  5. Mar 20, 2010 #4
    They are identical billiard balls I assume, in mass and otherwise.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Collision of billiard balls