A100 kg free-floating astronaut fires 0.1 kg of gas at a speed of 50.0 m/s from her propulsion pistol. what is the astronauts recoil speed?

answer; how far out of place which the object finished relative to the starting location;

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.