1. Not finding help here? Sign up for a free 30min 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!

A 2.0-kg ball is travelling east at 8.0 ~ Momentum

  1. Oct 29, 2012 #1
    A 2.0-kg ball is travelling east at 8.0 m/s when it has a perfectly elastic head-on collision with a 3.0-kg ball traveling west at 10.0 m/s. What are the final velocities of the two balls?

    Please help I don't know where to start
     
  2. jcsd
  3. Oct 29, 2012 #2
    You know momentum is conserved when bodies collide, start with the momentum principle:
    M1Vi + M2Vi = M1Vf + M2Vf

    And try another formula, which represents the conservation of kinetic energy:

    1/2(M1)(Vi)^2 + 1/2(M2)(Vi)^2 = 1/2(M1)(Vf)^2 + 1/2(M2)(Vf)^2
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook