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SOME ROCKET THEORY AND THE IMPORTANCE OF SPECIFIC IMPULSE (I sp ) As shown in the following figure, a rocket moves and increases its velocity by conserving momentum (mass multiplied by velocity) between the mass and velocity of the expelled propellant (M p , V p ) and the mass and velocity of the rocket (M R , V R ). In principle, either the velocity or mass of the propellant exhaust gas could be varied to produce a given increase in the velocity of the rocket ( D V,...