An astronaut with mass 84kg is at rest in space, before firing her water pack to move toward the shuttle. If the amount of water
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The momentul of the system preserves:
Ok, we found the speed after the collision.
Now, because the impact is plastic, it produces heat, sound energy and who knows what other forms of energy. We denote all this wasted energy with
Now, we write the energy conservation law:
From the above equation, you find