The formula for the force between two objects is F = GMm/r^2, where M and m are the masses of the two objects, G is a constant, and r is the distance between them. Solve the formula for M.
A. M = r^2/FGm
B. M = Fr^2/Gm
C. M = FGm/r^2
D. M = Gm/Fr^2
M = F r^2/Gm (solve for M by multiplying both sides by r^2/Gm and dividing by F)
Therefore, the answer is B. M = Fr^2/Gm.