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standard acceleration

The acceleration imparted by the earth's gravitation to a body located on the earth's surface: If you raise such a body up a bit and let it fall, it will accelerate 9.81 meters per second2 (32.17 feet per second2), in other words: in every second, its speed will increase by 9.81 meters per second (32.17 feet per second).

Standard acceleration, abbreviated as g, is often used as a measure for accelerations. For instance, an acceleration of 2 g corresponds to 2·9.81=19.62 meters per second2.