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4)The velocity required to establish a satellite at an altitude of a few hundred miles above the Earth is about 25,000 feet per second. This required orbital velocity is less at greater altitudes.
5)The force of gravity is no exception. Gravitational potential energy is usually given the symbol U g U_g UgU, start subscript, g, end subscript. It represents the potential an object has to do work as a result of being located at a particular position in a gravitational field
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