Inertia is a fundamental property of matter that resists changes in its state of motion. It is directly proportional to the object's mass.
Velocity is a measure of an object's speed and direction.
While an object's velocity can change due to forces acting on it, the object's inertia remains constant.
In summary:
* Inertia is a property of an object's mass and does not change with velocity.
* Velocity is a measure of an object's motion and can change due to forces.
Therefore, a heavier object will have a greater inertia than a lighter object, regardless of their velocities.