A rocket (with mass m = 3000 kilograms) orbits around a fictious planet named "Kerbin" with the periapsis of the orbit at 100 kilometers above the surface of Kerbin and apoapsis at 11,400 kilometers above the surface. The planet Kerbin has a radius of 600 kilometers and a mass of 5.29 x 10²² kilograms. The force of gravity on the rocket in its orbital plane is given by the 2D vector field F (7) = GMm i %3D 72 Irl where G = 6.67x10 is the universal gravitational constant, M is the mass of Kerbin and m is the mass of the rocket. The vector i = xî + yj is the position vector for the rocket.
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