If a hockey player starts from rest and accelerates at a rate of 2.1 m/s², how long does it take him to skate 30 m?
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Since Astronaut and wrench system is isolated in the space and there is no external force on it
So here momentum of the system will remain conserved
so here we can say
initially both are at rest
so here plug in all values
so here the astronaut will move in opposite direction and its speed will be equal to 0.20 m/s