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Which mathematical relationship best describes a graph of gravitational field strength versus distance? 
(one of the 3 pictures attached or none of the above?)

Which Mathematical Relationship Best Describes A Graph Of Gravitational Field Strength Versus Distance One Of The 3 Pictures Attached Or None Of The Above class=
Which Mathematical Relationship Best Describes A Graph Of Gravitational Field Strength Versus Distance One Of The 3 Pictures Attached Or None Of The Above class=
Which Mathematical Relationship Best Describes A Graph Of Gravitational Field Strength Versus Distance One Of The 3 Pictures Attached Or None Of The Above class=

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Pepe11id
gravitationnal field between two objets = k.m1.m2/d² 
none of the above
the graph is something like that
View image Pepe11
AL2006id
The gravitational force between two masses is proportional to

                               (mass-1) x (mass-2) / (the distance between them)-squared

Do you see (distance-squared) in the denominator there ?

That steers you straight to the function [ y proportional to 1/x² ] ... in the middle.

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