In a later part of this analysis, the rocket does indeed escape earth's gravity field. in the beginning part of this analysis, the rocket does not escape earth's gravity field. , gravity acceleration, possesses negligible variation - i.e., is assumed constant.there is a realistic assumption of constant fuel burn rate implying constant thrust.the rocket and its propellant fuel mass are solely involved in upward - direction translational rectilinear motion.thrust acts precisely at the rocket's center of mass.
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