Kepler's first law states that the orbit of a planet is an ellipse with the sun at one focus
Kepler's second law states that as a planet moves around its orbit, it sweeps out equal areas in equal times.
Kepler's third law states that the square of the period of revolution of any two planets is directly proportional to the cube of their mean distances from the Sun.
Geostationary satellites:
be in an orbit above the Earth's equator
rotate in the same direction as the Earth's rotation
have an orbital period of 24 hours
Gravitational potential, Vg, of an object is the energy required to move the object to a point from infinity
Gravitational potential energy is the work done to move a mass from infinity to a point in a gravitational field
The minimum velocity required to escape the gravitational field of a mass is called the escape velocity and is independent of the object's mass