At a point in the trajectory of a space vehicle moving about the Earth, the altitude above the mean sea level is 6400 km, and the speed with reference to a coordinate system fixed to the center of mass of the Earth is 9 km/s. Assume that the Earth is a sphere with a radius of 6400 km and that GM_Earth = 3.98 x 10¹⁴ m³/s², where G is the universal gravitational constant and M_Earth is the mass of the Earth. The trajectory is: