Question

What do you mean by state of motion? What are the parameters to measure it? Can a body at rest be described by these parameters

Answer 1

The state of motion of an object is defined by its velocity - the speed with a direction. Thus, inertia could be redefined as follows: Inertia: tendency of an object to resist changes in its velocity. An object at rest has zero velocity - and (in the absence of an unbalanced force) will remain with a zero velocity.

State of motion of an object is defined velocity. Velocity is defined as speed in which an object moves. Everything with mass is succeptible to the classical Newtonian laws of motion.

For example: Ball rolling down a hill.

The ball has a specific mass and when in motion will have a velocity attributed to it in terms of distance in relation to time.