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A rocket, which is in deep space and initially at rest relative to an inertial reference frame, has a mass of 84.1 x 105 kg, of which 6.63 x 105 kg is fuel. The rocket engine is then fired for 220 s, during which fuel is consumed at the rate of 470 kg/s. The speed of the exhaust products relative to the rocket is 3.69 km/s.

(a) What is the rocket's thrust? After the 220 s firing, what are

(b) the mass and

(c) the speed of the rocket?

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