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Newton's Law of Gravitation States That Two Bodies with Masses m1m _ { 1 }

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Newton's Law of Gravitation states that two bodies with masses m1m _ { 1 } and m2m _ { 2 } attract each other with a force
F=Gm1m2r2F = G \frac { m _ { 1 } m _ { 2 } } { r ^ { 2 } }
where rr is the distance between the bodies and GG is the gravitation constant. If one of bodies is fixed, find the work needed to move the other from r=lr = l to r=gr = g .


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