VELOCITY

Uniform velocity:

     A particle is said to have uniform velocity, if magnitude as well as direction of its velocity remains same on this is  possible only when the particles move in the same straight line without reversing its direction.

Non uniform velocity:

     A particle is said to have non-uniform velocity, if either of magnitude or direction of velocity changes or both changes.

Average velocity:

      Average velocity is defined as the ratio of displacement to time taken by the body.

Instantaneous velocity:

   Instantaneous velocity is defined as the rate of change of position vector of particles with time.