text: all about velocity? i have a report about this, its all about velocity and there are 2 kinds of velocity the uniform velocity and variable velocity. help about this!!11 velocity a vector quantity that has both speed and direction... uniform velocity is a body's speed and direction is not changing... thus, has zero acceleration... variable velocity is either the boddy's speed or direction is changing or both speed and direction is changing... this means that the acceleration of the body is non-zero.... it may be constant acceleration or also varrying...  speed is scalar, only with magnitude... velocity is vector both with speed and direction... acceleration is vector, to say a change in speed or direction...