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 positionx这样一个机构的straight line it travels at a given timetis

x(t)=x₀+v· t,

wherex₀is its position at the moment we start measuring time andvis its velocity.