G is the acceleration due to gravity at the surface of the earth, and it is used as a unit of acceleration in the English system of measurements. G is not exactly constant, but varies a little over the earth's surface, so an average value of 32.2 feet per second per second is used. In the SI system, G is 9.81 meters per second per second, but is not usually used as a unit of acceleration. Because we use inches per second as a unit of velocity, it would make more sense to use inches per second per second as an acceleration unit, but G has a long tradition behind it.
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