An object travels North at # 5 m/s# for #2 s# and then travels South at # 1 m/s# for # 2 s#. What are the object's average speed and velocity?
Total distance travelled by the object is
And,net displacement of the object is
negative sign means direction of displacement is towards North.
Now,average speed =Total distance covered/total time taken=
And,average velocity =Total displacement/Total time taken
Remember average speed is a scalar quantity wheras average velocity is a vector quantity