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There is no fixed figure for earths gravity.

The effect of earths mass (or gravity) depends on its mass and how close you are to it.

the gravitational force (f) on an object (by the earths gravity) can be calculated by:

.

f (newtons) = (G * m1 * m2) / d^2

.

key:

m1 = earths mass (5.974 * 10^24 kg)

m2 = objects mass (kg)

d = distance between their centres of gravity (metres)

G = newtons gravitational constant (6.672 * 10^-11)

.

notes:

the force on the object is equal to the reaction force on the earth.

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