A 1000-Kg Space Probe Is Motionless in Space

question 65

Multiple Choice

A 1000-kg space probe is motionless in space. To start moving, its main engine is fired for 5 s during which time it ejects exhaust gases at 5000 m/s. At the end of this process it is moving at 20 m/s. The approximate mass of the ejected gas is:

• A) 0.8 kg
• B) 4 kg
• C) 5 kg
• D) 20 kg
• E) 25 kg

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