An astronaut is drifting away from the space shuttle at a velocity of 1.1m/s. He fires his gun's 30g bullets to return to his ship. The mass of the astronaut and his spacesuit is 123kg, his gun has a mass of 12kg and the bullets leave the gun at a velocity at 250 m/s.
What is the approximate minimum number of bullets that he will need to fire to begin drifting back to the ship?
3. The attempt at a solution
mv=mv*(number of bullets)
Therefore the astronaut will need to fire 20 bullets to start drifting backwards. Is this right?