Question

what is meant by inertia

Answer 1

a tendency to do nothing or to remain unchanged.

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Answer 2

It is the tendency of a body to oppose  its state.

For example, let a person be standing inside a bus that is not moving, i.e he is at rest. When the bus suddenly starts moving, he shows slight movement(resistance) in the direction opposite to the direction of the movement of bus. Here, the person is resisting the motion when he is initally in the state of rest.

This is called Inertia.