Question: While moving at 500 m/s, a space probe fires its main engine and ejects 100 kg of exhaust gases at 4000 m/s. If this causes

While moving at 500 m/s, a space probe fires its main engine and ejects 100 kg of exhaust gases at 4000 m/s. If this causes the probe's speed to double, its initial mass is equal to

a) 600 kg

b) 700 kg

c) 800 kg

d) 900 kg

e) 1000 kg

Please show all calculations.

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