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Momentum qs

  1. Mar 25, 2010 #1
    1. The problem statement, all variables and given/known data
    A girl of mass 48kg runs toward her sationary 2.0kg skateboard and jumps on. The horizontal velocity of the girl just before she makes contact with the skateboard is 4.0m/s to the right. Disregard the effects of friction.
    a)Determine the velocity of the girl after she has landed on the skateboard.
    b)The girl then travels at this speed for a short time before jumping off, still traveling at the same speed as the skateboard. What is the velocity of the skateboard after she jumps off.


    2. Relevant equations

    p0=pf
    (m1)(v01) + (m2)(v01) = (m1)(vf1) + (m2)(vf2)

    3. The attempt at a solution
    ok for b:
    48kg * 4.0m/s = 50kg(v2)----> is this ok to consider skateboard and girl one
    v2 =3.84m/s

    ok for c) since she jumps off and has the same velocity, that means the skateboard will also have the same velocity
     
  2. jcsd
  3. Mar 25, 2010 #2
    It's ok to to consider girl and skateboard as one if they have the same velocity, wich
    they have. The answer is correct
    [/QUOTE]
    This is OK as well.
     
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