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Rocket work reflects the Conservation of Energy or the Law of Equilibrium or the sum of the forces is zero.

Newton's Third Law is the manifestation of the sum of the vector forces is zero. Newton did not properly formulate Gravitational Energy.

The Gravitational Energy is E= -GmM/r + mcV = -mu/r + mcV, where V is the vector velocity of m. Newton did not include mcV, This resulted in today's dark energy confusion.

The Second Law is proper for the Rockets, F = ma.

F= XW = [d/dr, Del]m[ -u/r, cP] = cp/r[v/c -1, -1R + v/c 1R + rdm/mdr 1R ]

where DelxV is zero at when Tangent and Gradient are parallel.

where Vdm/dt is the rocket exhaust force and mdV/dt is the rocket force.

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