Input (grade 4): Acceleration due to gravity varies over the surface of the Earth, generally increasing from about 9.78 m\/s2 (32.1 ft\/s2) at the equator to about 9.83 m\/s2 (32.3 ft\/s2) at the poles.
Output (grade 9): The value adopted in the International Service of Weights and Measures for the standard acceleration due to Earths gravity is 980.665 cm\/s2, value already stated in the laws of some countries.