A body is in uniform linear motion if its velocity is a constant vector. A body in uniform linear motion travels along a straight line and at a constant speed. When looking at a body in a uniform linear motion you might be interested in calculating its position in time. The position x of such a body on the straight line it travels at a given time t is

x(t)= x0 + v · t,

where x0 is its position at the moment we start measuring time and v is its velocity.