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: Elastic collision 2 dimension unequal masses not at rest

  1. Nov 9, 2008 #1
    Please help! i know how to do a elastic collisions in 1 dimension, but the 2D is too confusing...here is my problem:

    You have a blue ball with a mass of 1.5 kg moving with a speed of 4.5 m/s in a direction below the positive x-axis. You have a red ball with a mass of 3.6 kg moving with a speed of 2.7 m/s in a direction to the left of the negative y-axis. When the balls collide, find the final velocity (magnitude and direction) for each of the two balls.
  2. jcsd
  3. Nov 9, 2008 #2
    simple way to solve this is by using galilean transformation equations and turn one of the balls into a stationary one and just use the 1D formulas
  4. Nov 9, 2008 #3
    Conservation of momentum holds in both the x- and y-directions.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook