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Assuming the mass is on the earths surface.

Acceleration due to gravity at earth surface = 9.82 m/s/s.

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The force on the mass (and the reaction on the earth) is :

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force (newtons) = mass * acceleration = 1 * 9.82 = 9.82 newtons

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Can also use : (G*m1*m2) / d2 , for force and reaction between any two

masses

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

m1 = mass of earth (5.974 * 1024 kg)

m2 = mass of object (1 kg )

d2 = distance between centres of gravity, squared ( 4.059 * 1013 )

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