Question

an objects inertia is a measure of its resistance to a change in its state of motion. what physical property of the object is inertia directly proportional to?
velocity
mass

Explanation:

Inertia is a property of matter that depends on mass. The more massive an object is, the greater its inertia, and the more it resists changes in its state of motion. Velocity does not determine inertia.

Answer:

Mass