Gravity Changes with Altitude

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Gravity changes with altitude. The gravitational force is proportional to 1/R2, where R is your distance from the center of the Earth.

Here is an example: The radius of the Earth at the equator is 6400 kilometers. Let's say you were in a jet at the equator that was 40 kilometers high above the earth’s surface.

g2 = 9.67 m/s2

The gravitational force would have decreased about 1.2 % when the jet is flying at 40 km.