According to newton’s first law of motion, what will an object in motion do when no external force acts on it?

if no external force is acting on it so it will remain in motion acoording to inertia ( inertia is a property of matter it continues in existing state either in rest or motion

r = ρ x length / area  

ρ = r x area / length  

ρ is in ohm-meters  

in basic units, it is m³kg/s³a²  

i think this is it.