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Consider a rocket launched from a platform at sea level on Earth, in the vertical direction....

Consider a rocket launched from a platform at sea level on Earth, in the vertical direction. Atmospheric drag can be ignored, but gravity is to be taken into account (can be assumed constant). The dry mass is 1000 kg, and the total propellant mass is 4000 kg. The specific impulse is equal to 300 s, and the propellant flow is equal to 50 kg/s (can be assumed constant). What is the acceleration of the vehicle at liftoff, and what is it at engine burnout?

The answer is 19.6 m/s2 and 137.3 m/s2, but I would like to know how to arrive to that answer

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