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For a vehicle in gravitation less space, determine the mass ratio necessary to boost the vehicle velocity by 1600 m/s? The effective exhaust velocity is

For a vehicle in gravitation less space, determine the mass ratio necessary to boost the vehicle velocity by 1600 m/s? The effective exhaust velocity is 2000m/s. Also, if the total vehicle mass is 4000kg, what is the corresponding propellant mass?

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