Next: Instantaneous Velocity Up: Motion in One Dimension Previous: Displacement

# Average Velocity

Definition: Average Velocity is displacement over total time. Mathematically:

 = (1)
Note:
• the overbar is frequently used to denote an average quantity
• t is always > 0 so the sign of depends only on the sign of x .

Graphical interpretation of velocity: Consider 1-d motion from point P (with coordinates xi , ti ) to point Q (at xf , tf ). We can plot the trajectory on a graph (see Figure 2.1).

Then from Eq.(2.1) is just the slope of the line joining P and Q.