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: Angular elastic collision

  1. Nov 4, 2007 #1
    1. The problem statement, all variables and given/known data

    Two identical pucks are on an air table. Puck A has an initial velocity of 2.6 m/s in the positive x-direction. Puck B is at rest. Puck A collides elastically with puck B and A moves off at 2.50 m/s at an angle of +16.3° above the x-axis. What is the speed and direction of puck B after the collision? (Take angles above the x axis to be positive and below to be negative.)
    ____ m/s at -73.7 °

    2. Relevant equations


    3. The attempt at a solution

    i know this is an elastic collision but i do not know how to solve it for a collision that is at an angle. I got the -73.7 because i know that if anythign is hit at an angle...the total angle of the 2 objects should add to 90 degrees. but how do i solve for the final velocity?
  2. jcsd
  3. Nov 4, 2007 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Momentum is conserved! Write equations for conservation of momentum for horizontal and vertical components.
  4. Nov 4, 2007 #3
    how do you do it for the initial and final? i dont understand this one
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook