Consider two celestial bodies that have equal masses and experience a gravitational force of 85.0 N towards one another. If their center are 36.0 mm apart, determine each of their masses.
F = G m1 m2 / r2 and m1 = m2
F * r2 /G = m2 F = 85 N r = .036 m G = 6.67430 x 10-11 N m2 / kg2
85 * (.036)2 / (6.67430 x 10-11) = m2 <====== NOTE: m2 , Also 'm' will have kg units
You should be able to take it from here !