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

Algebra ->  Test -> 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      Log On


   

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) About Me  (Show Source):
You can put this solution on YOUR website!
F= %28%28alpha%29%2Am1%2Am2%29%2Fr%5E2
Multiply both sides of the equation by r^2
Fr%5E2= %28%28alpha%29%2Am1%2Am2%2Ar%5E2%29%2Fr%5E2

Fr%5E2= %28%28alpha%29%2Am1%2Am2%29
Divide both side by F
r%5E2= %28%28alpha%29%2Am1%2Am2%29%2FF
Take the square root of both sides
r= +/-sqrt%28%28%28alpha%29%2Am1%2Am2%29%2FF%29
But r cannot be negative. So we take the positive root