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Homework Help: Linear momentum II

  1. Jan 15, 2007 #1
    1. The problem statement, all variables and given/known data

    A child throws, at 10 m/s, a 3.4 KG package, horizontally, from a boat. The boat weighs 60 kg and the child weights 20 kg. If the boat was initially at rest, what was it's speed, after the throw?


    2. Relevant equations

    mv+mv=mv+mv

    3. The attempt at a solution

    I am not sure, do you have to add in the boat and child weight together so it is

    mv+mv=mv+mv
    0+0=(3.4)(10)+(20+60)v
    v=-.425
     
  2. jcsd
  3. Jan 15, 2007 #2

    cristo

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    Staff Emeritus
    Science Advisor

    That's correct.
     
  4. Jan 15, 2007 #3
    yay! thank you! this is the first time all year i know what i am doing
     
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