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The gravitational constant, approximately 6989667400000000000â 6.674Ã10â11 Nâm2/kg2 and denoted by letter G, is an empirical physical constant involved in the calculation(s) of gravitational force between two bodies.
On the surface of the Earth, it's value is 9.8 meters per square second or 32.2 feet per square second. The weight W, or gravitational force, is then just the mass of an object times the gravitational acceleration. The gravitational constant g depends on the mass of the planet and on the radius of the planet.