An astronaut is wearing a jet pack on a space walk. Including the jet pack, he has a mass of 90 kilograms. Initially, he is not moving with respect to the spaceship nearby. If the astronaut fires 0.06 kilograms of gas from his thruster at a speed of 700 meters per second, what will his speed be after the firing?
a. 0.32 meters/second
b. 0.47 meters/second
c. 4.7 meters/second
d. 42 meters / second
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