An object travels North at #5 m/s# for #8 s# and then travels South at #5 m/s# for # 2 s#. What are the object's average speed and velocity?
Speed is distance traveled per unit time, whereas velocity is displacement per unit time.
We will assume an x-y coordinate system to be the reference frame, where south is negative and north is positive in direction.
Let's derive the magnitude of the displacement in each direction given your data,
are the average speed and velocities of the moving body.