* Inertia: Inertia is the tendency of an object to resist changes in its motion. The more inertia an object has, the harder it is to get it moving or to stop it once it's in motion.
* Mass: Mass is the amount of matter in an object. The more massive an object, the more inertia it has.
* Speed: Speed is how fast an object is moving. Speed itself does not affect an object's inertia.
In Summary:
The heavy object will have the most inertia, regardless of speed.
Why?
Inertia is directly proportional to mass. A heavier object has more mass, and therefore, more inertia. The speed of an object doesn't change its inherent resistance to changes in motion.
