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3. A 125 kg astronaut and his equipment are initially at rest. To move forward with a velocity of 1.55 m/s, the astronaut fires

3. A 125 kg astronaut and his equipment are initially at rest. To move forward with a velocity of 1.55 m/s, the astronaut fires a 493 N rocket in the backward direction. How long does the astronaut need to fire the rocket?

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