Two objects one of m=20,000kg and another of 12,500kg, are placed at a distance of 5 meters apart. what is the force of gravitation between these two objects

Forces of gravity between two objects =

G · (mass₁) · (mass₂) / (distance between them)²

G = 6.67 x 10⁻¹¹ m³ / kg · s²

So the gravitational forces (one in each direction) are

Forces = (6.67 x 10⁻¹¹ m³/kg·s²) · (20,000 kg) · (12,500 kg) / (5 m)²

Forces = (6.67x10⁻¹¹ · 2x10⁴ · 1.25x10⁴)/(25) · (m³·kg·kg/m²·kg·s²)

Forces = (6.67 · 2 · 1.25 x 10⁻³ / 25) · (kg·m/s²)

Forces = (6.67 x 10⁻⁴) · (kg·m/s²)

Forces = 0.0001667 Newton   (about 0.0024 ounce)

Note: The gravitational force acts between the centers of the objects, and that's where the "distance between them" is measured.  For two masses of 20,000 kg and 12,500 kg, there's a chance that you might not even be able to get their centers with 5 meters of each other, even if they're made of concrete or steel.  If not, then the gravitational forces between them would be less than 0.0024 ounce.)

the answer is b, have negligible mass