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A spacecraft is floating motionless in space and then briefly fires its rockets to start moving.

A spacecraft is floating motionless in
space and then briefly fires its rockets to
start moving. When firing its rockets, the
spacecraft ejects 3,000 kg of exhaust at
an average velocity of 3,000 m/s. If the
mass of the rocket without the exhaust is
150,000 kg, what is the speed of the
spacecraft after the rockets have fired (in
m/s)?

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