Question

when an object is moving with zero acceleration then what is its position

Answer 1

object is in motion
I am not sure !

Answer 2

$\vec{a}=0\\\Rightarrow \frac{d\vec{v}}{dt}=0\\\Rightarrow \vec{v}=\vec{v_0}\\\text{where } \vec{v_0} \text{ is a constant of integration.}\\\Rightarrow \frac{d\vec{x}}{dt}=\vec{v_0}\\\Rightarrow \vec{x}=\vec{x_0}+\vec{v_0}t\\\text{where } \vec{x_0} \text{ is another constant of integration.}\\\text{The above equation is the vector equation of a straight line in space.}\\\text{The particle will always move in a straight line.}$