An object travels North at #9 m/s# for #7 s# and then travels South at #7 m/s# for # 6 s#. What are the object's average speed and velocity?
The average speed is the total distance over the total time.
The total distance i s
The total time is
Thus, the average speed is
The average velocity is the total displacement over the total time.
If the object goes
The total time is the same
Thus, the average velocity is
Don't forget to add the direction "North" because velocity is a vector quantity.