Question

why state of uniform motion considered as natural state.
of an object?​

Answer 1

$\bf\large\underline\blue{Answer:-}$

The idea is that the natural state of motion is not rest but uniform velocity. This ideal of Galileo is formally stated by Newton as the First Law of Motion. Every object continues in its state of rest or of uniform velocity in a straight line as long as no net force acts on it.