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Momentum, throwing a ball

  1. Nov 3, 2009 #1
    1. The problem statement, all variables and given/known data
    A man is standing on a frozen pond (which is mean less).
    He throws a ball m=250 g
    The speed of the ball is 8.0 ms-1
    The man moves back at a speed of 0.05 ms-1
    How heavy is the man ?


    2. Relevant equations

    p1=p2
    m1 x v1 = m2 x v2

    3. The attempt at a solution

    p1=p2
    m1 v1 = m2 v2

    250 x 8 = m2 x 0.05
    2000 = 0.05 m2
    m2= 40000 [g] = 40 [kg]

    is this correct ?


    Thanks,
    dave
     
  2. jcsd
  3. Nov 3, 2009 #2
    Correct.
     
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