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Inertia of a body is measured / indicated by its mass.

Density of a rubber ball is   less than the density of stone.   So as they are of the same size,  mass of a rubber ball is less than that of a stone.   So inertia of a stone is more.

mass of a train is more.  So it has more inertia.

5 Rs coin has  more mass than that of a 1 Rs coin.  So a 5 Rs coin has more inertia.

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