Question

what is mean by intertia

Answer 1

Inertia is the resistance of any physical object to any change in its state ofmotion. This includes changes to the object's speed, direction, or state of rest. Inertia is also defined as the tendency of objects to keep moving in a straight line at a constant velocity.

Answer 2

inability of an object to change its state of rest or uniform motion is called its inertia
it can be divided into three
1) inertia of rest
2)inertia of motion 
3)inertia of direction