Recoil of astronaut pushing a tool

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SUMMARY

The discussion centers on the conservation of momentum principle applied to an astronaut throwing a tool in space. The astronaut, with a total mass of 90 kg, throws a 0.70 kg tool at a velocity of -12.0 m/s. By applying the conservation of momentum equation, the astronaut's resulting velocity can be calculated, confirming that momentum before and after the throw remains constant. This scenario illustrates the practical application of physics concepts in a zero-gravity environment.

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Homework Statement



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, I am just not sure.
 
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Look at conservation of momentum.
 


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

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