Physics attraction question

Question

What is the attraction between two spherical masses, one 120,000 kg and the other 400,000 kg if separated by 100 meters?

Answer 1

Use the universal gravitation equation F = G×M×m/r². Plug in the values of the gravitational constant, the masses and the radius to get F = [6.67408 × 10^-11 m³ kg^-1 s^-2] × [120,000kg] × [400,000kg]/[100m]². Multiply it out to get F = 6.67408 × 10^-11 × 120,000 × 400,000 / (100²) m³ × kg^-1 s^-2 × kg² / m² = 3.20356 × 10^-4 kg × m / s² = 3.20356 × 10^-4 N