In everyday uise an in kinematics, the speed o an object is the magnitude o its velocity (the rate o chynge o its position); it is sicweys a scalar quantity.[1] The average speed o an object in an interval o time is the distance travelled bi the object dividit bi the duration o the interval;[2] the instantaneous speed is the leemit o the average speed as the duration o the time interval approaches zero.

Speed can be thocht o as the rate at which an object covers distance. A fast-muivin object haes a heich speed an covers a relatively lairge distance in a gien amoont o time, while a slow-muivin object covers a relatively smaw amoont o distance in the same amoont o time.
Common seembols
SI unitm/s, m s−1


  1. Wilson, Edwin Bidwell (1901). Vector analysis: a text-book for the use of students of mathematics and physics, founded upon the lectures of J. Willard Gibbs. p. 125. This is the likely origin of the speed/velocity terminology in vector physics.
  2. "Speed & Velocity".