An object of mass 30kg is in free fall in a vacuum where there is no air resistance. Determine the acceleration of the object.

That all depends on the planet toward which the mass is falling.

If this happens to be taking place near the Earth, then the object accelerates

at the rate of about 9.8 meters per second every second.

Furthermore, if there is truly no air resistance, then it makes no difference whether

the object is a feather, a mass of 30 kg, or a school-bus. All objects accelerate at

the same rate regardless of their mass.