A 2200-kg spacecraft fires its retrorocket to decrease its orbital speed. The engine burns fuel at the rate of 10 kg/s, and the velocity of the exhaust gas relative to the spacecraft is 2700 m/s. If the initial speed of the spacecraft is 8000 m/s, determine
a. The initial thrust exerted on the spacecraft by the engine.
b. The initial deceleration of the spacecraft.
c. The velocity of the spacecraft after 800 kg of fuel have been burned.
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