Question

two balls of same size one of rubber and second of iron are placed on floor. which ne has more inertia?

Answer 1

Since iron is denser than rubber, mass of the iron ball will be greater than rubber ball. More mass means more inertia. So the iron ball had more inertia.

Answer 2

Iron ball has more inertia compared to rubber ball.

Reason :

Inertia is the natural tendency of an object to resist the change in state of rest or motion.

Inertia is a measure of mass.
So as mass increases , inertia possessed by an object also increases.

As Iron ball has more mass compared to rubber ball. Hence it has more inertia.