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Final velocity of an elastic collision between a ball and a plank on a frictionless s

  1. Dec 11, 2012 #1
    1. The problem statement, all variables and given/known data
    Currently studying for a physics final on Wednesday 12/12/12
    The problem can be found here


    2. Relevant equations
    Not very sure.

    vfball=(v0(mball-mplank)+2mplankv0,plank)/(mball+mplank)
    mballv0=(mball+mplank)vf

    3. The attempt at a solution
    I have no idea how to do a. I've tried
    vfball=(v0(mball-mplank)+2mplankv0,plank)/(mball+mplank)
    But it just comes to 0.

    b.
    I've thought about it and the only possible way to get the answer given that I can think of is this:
    mballv0=(mball+mplank)vf
    mv0=2mvf
    vf=v0/2

    Does this involve angular momentum as well? Or inertia? Any help would be gratefully appreciated!
     
  2. jcsd
  3. Dec 11, 2012 #2

    gneill

    User Avatar

    Staff: Mentor

    Re: Final velocity of an elastic collision between a ball and a plank on a frictionle

    Yes, angular momentum is involved, as is rotational KE. So, start by writing all the conservation equations.
     
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