Average+Speed+vs.+Average+Velocity

Although these two things appear to be the same displacement and distance seperate these two rates. Distance does not reveal anything about the direction of motion, displacement on the other hand does. That is the fundamental diffence between the two. Speed simple indicates how fast an object is moving while velocity indicates speed as well as the direction of motion. Velocity, unlike speed can be negative. So we shall look at the motion of the ball. The distance that the ball travels from one end of the ping pong table to the other end over time equal to the speed. Contrastingly the velocity of the ball depends on which end of the table you are measuring it from. If you are on the left and the ball is going to the right, away from you, then the velocity is positive, but if the ball is coming towards you, traveling to the left, its velocity is negative.
 * Average Speed || Average Velocity ||
 * Distance/elapsed time || Displacement/elapsed time ||

Tasha