Physics Help?

Question

Two objects attract each other with a gravitational force of magnitude 0.99 10-8 N when separated by 19.4 cm. If the total mass of the objects is 5.10 kg, what is the mass of each?

Answer 1

F = G * M * m / d^2

You have F, G (it is a constant found in books or wikipedia) and d.
You also have (M + m = 5.10 kg)

By substitution:

M = 5.10 - m

F = G * (5.10 - m) * m / d^2

One unknown (m).
Go for it.