Answer :

(c) five rupee coin.


Inertia of a body is the resistive force which opposes its motion. And we know that more the mass the resistive force will be more i.e. from this we can conclude that inertia of any body is directly proportional to its mass. Now, if we compare the masses of 50 paisa coin, one rupee coin and five rupee coin we will find out that the five rupee coin has maximum mass which suggest that the inertia of the five rupee coin will be maximum in the given three cases. So, in short the easy way to find out about inertia is to look upon the mass of the object. More the mass more will be its inertia.


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