what is the gravitational field of a 20kg space rock if it's radius is 10m?

The acceleration of gravity on the surface of that rock is G M / R² =                  (6.67 x10⁻¹¹) (20 kg) / 100m² = 1.334 x10⁻¹¹ m/s²That's  1.36x10⁻¹²  of the acceleration of gravity on Earth's surface.An astronaut who weighs 200 pounds on Earth would weigh about 0.000 000 003 35 ounce on that space rock.  If he wereto blink his eyes hard, he would propel himself into orbit, whereasif he sneezed, he would escape from the rock's gravitational clutches.