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Confidence votes 317. Inertia is rotary momentum; an object's ability to continue spinning when a decelerating force is applied. Just as a heavy object takes more effort to stop from the same speed as a light object, so does a heavy object take more effort to stop from turning at the same speed as a light object. So assuming they are turning at the same angular velocity, the heavier one has a larger inertia.
Inertia is the property of a body to remain in rest or motion as long as no force acts on it. Inertia increases with increase of mass. inertia is the property of every object having mass to resist any change in its state of rest or motion unless and until an external force is applied on it.