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: What are their velocities in m/s after the collision?

  1. Mar 24, 2009 #1
    Hello every one,
    I am new here, I 've just registered few minutes ago, and I wish I get the help I need.
    My question is about collision, here is it:
    Two of equal masses A and B have velocities of 6i m/s and -4i m/s respectivly. If they collide elastically, what are their velocities in m/s after the collision?

  2. jcsd
  3. Mar 24, 2009 #2


    User Avatar

    Staff: Mentor

    Re: collision

    Thread moved to Homework Help forums.

    Welcome to the PF, remaan. You must show us the relevant equations and your attempt at a solution before we can help you. That's part of the PF rules for homework help.

    How would you go about setting up this problem's solution?
  4. Mar 25, 2009 #3
    Re: collision

    I tried doing the following :
    Because it is elastic colliosn, then the Enery and the momentom are conserved and I used the conservation of momentom

    pi= pf

    and cancling the equal masses we get that the sum of their voliecities are equal in both cases, however, we still cannot say that have same velocities after the collison.

    That was my attemp
    Hope that works
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Similar Threads for velocities collision
Physics Word Problem: Arrow and moving target collision