Question

is all objects have inertia​

Answer 1

Inertia is a force which brings all objects to a rest position.

All objects have this tendency - they have inertia. ... Mass is that quantity that is solely dependent upon the inertia of an object. The more inertia that an object has, the more mass that it has. A more massive object has a greater tendency to resist changes in its state of motion.

                         

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