SOLUTION: http://m1146.photobucket.com/albumview/albums/pigrabbit_8/8CF760D8-1D2E-4B6D-BA7A-AE2B60A1A274-2381-000001D146DC01DC_zps5a4e8ba5.jpg.html?newest=1 Please help and explain the an

Question 664858: http://m1146.photobucket.com/albumview/albums/pigrabbit_8/8CF760D8-1D2E-4B6D-BA7A-AE2B60A1A274-2381-000001D146DC01DC_zps5a4e8ba5.jpg.html?newest=1
Please help and explain the answer. I need help with Newton's Law of Universal Gravitation. Thank you.
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
F=
Multiply both sides of the equation by r^2
=

=
Divide both side by F
=
Take the square root of both sides
= +/-
But r cannot be negative. So we take the positive root

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