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The inherent property of all the bodies by virtue of which they cannot change their state of rest or uniform motion along a straight line by their own is called inertia.
  • Inertia is not a physical quantity, it is only a property of the body which depends on mass of the body.
  • Inertia has no units and no dimensions.
  • Two bodies of equal mass, one in motion and another is at rest, possess same inertia because it is a factor of mass only and does not depend upon the velocity.

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