In equation form average velocity is . Instantaneous Speed and Velocity Instantaneous speed is the speed at a particular instant of time. One would read it directly from a speedometer. It is a scalar. The units are the same as for average speed.
Instantaneous velocity is the instantaneous speed plus the direction the object is headed.
It is a vector. The units are the same as for average speed. The average acceleration of an object is its change in velocity divided by the time required to make the change. It is a vector and has the same direction as the change in velocity. In equation form average acceleration is where is the final velocity and is the initial velocity.