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## Homework Statement

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?

## Homework Equations

mv=mv?

**3.**

**The attempt at a solution**mv=mv*(number of bullets)

(135)(1.1)=(0.03)(250)*n

148.5=7.5n

n=19.8

Therefore the astronaut will need to fire 20 bullets to start drifting backwards. Is this right?

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