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Rocket Ejection and Linear Momentum

A rocket with initial mass of 8.0 x 10^3 kg is fired vertically. Its exhaust gases have a relative velocity of 2.5 x 10^3 m/s and are ejected at a rate of 40 kg/s.

a) What is the initial accerleration of the rocket?
b) What is the acceleration after 20s have elapsed?

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