Question

What is the inertia??????

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Answer 1

Inertia is the resistance, of any physical object, to any change in its velocity. This includes changes to the object's speed, or direction of motion. 
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Answer 2

Inertia is the inability of an object to move on its own, come to rest on its own, or change its direction on its own, without an external unbalanced force. It is of 3 types:

1. Inertia of rest
2. Inertia of motion
3. Inertia of Direction