Question

when do we say that an object is in motion or at rest​

Answer 1

if an object cover any distance in an interval of time than it is in motion

if an object remains constant and does not cover any distance than it is known as in rest

Answer 2

$\huge\fbox\mathcal\red{Motion\: or\: rest}$

An object is said to be in the motion when it moves from one place to another and in rest when it does not move and be in one place