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Physics Homework Question due in 20mins, literally have no idea what i'm doing

  1. Dec 12, 2009 #1
    1. The problem statement, all variables and given/known data

    A(n) 71.3 kg person throws a(n) 0.047 kg snowball forward with a ground speed of 45 m/s. A second person, of mass 64.7 kg, catches the snowball. Both people are on skates. The first person is initially moving forward with a speed of 2.28 m/s, and the second person is initially at rest.

    What is the velocity of the first person immediately after the snowball is thrown? Disregard friction between the skates and the ice.

    Answer in units of m/s


    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Dec 12, 2009 #2
    3. The attempt at a solution ???

    What method do you use to solve this problem?
     
  4. Dec 12, 2009 #3
    Conservation of momentum which states that the mass and velocity of the snowball thrower and whatever he lets go of is constant. Imagine yourself in the problem- or on a desk chair with feet up and shoving a bowling ball forward as fast as you can. You will recoil. Forget the second person altogether.

    (mass of snowball + mass of skater)*2.28m/s=(mass of snowball*45m/s)+mass of skater* unknown velocity
     
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