Question

which characteristic does inertia describe?
o how long an object is
o how large an object is
o how fast an object is moving
o how difficult it is to change an objects motion

Explanation:

Inertia is a property of matter that resists changes in its state of motion. It is related to an object's mass and how difficult it is to start, stop, or change the object's velocity. It has nothing to do with the length, size, or current speed of the object.

Answer:

how difficult it is to change an object's motion