physics gravitational force question, help please :)

Question

A physicist is trying to measure the gravitational force between two lead spheres. The first sphere has a mass of 7.2 kg and the second sphere has a mass of 11.4 kg. The two spheres are measured to attract each other with a force of 5.5 x 10−8 Newtons. Find the distance beween the spheres.

Give your answer ...
in terms of meters, to a precision of hundreths of a meter. Use a format like #.## in your answer.

Answer 1

try:

 

F=(G*m₁*m₂)/R²

 

G= universal gravitational constant

 

solve for R.

Answer 2

What is Newton's gravitational law? Use that and you can get R since you know the masses and the force between each. 

Best - David