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A moving object will continue moving in the same direction and at the same speed unless some force acts upon it. The only effective way to do this with a spacecraft is to eject mass away from it. By using combustible fuel we can eject mass at a high speed, which larger velocity changes than ejecting material at a low speed.

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7y ago
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10y ago

Stop trying to cheat in homework i know you are trying to find thr thing from pearson interactive science chpt.7 lesson 2 question 4

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Q: Why is fuel needed to change the speed or directions of a probe in space?
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