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Recoil of astronaut pushing a tool

  1. Apr 2, 2009 #1
    1. The problem statement, all variables and given/known data

    An astronaut stranded in space throws a 0.70kg tool backwards at -12.0m/s in order to return to her spaceship. If she and her spacesuit together have a total mass of 90kg, how fast and in what direction is she moving after throwing the tool?

    So
    Et=Et

    I'm not sure what to use. It has to be one that uses mass and velocity, im just not sure.
     
  2. jcsd
  3. Apr 2, 2009 #2
    Re: Momentum

    Look at conservation of momentum.
     
  4. Apr 3, 2009 #3
    Re: Momentum

    Got it, thanks. All I ususally need is something to jumpstart my brain.
     
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