# An object travels North at #9 m/s# for #4 s# and then travels South at #3 m/s# for # 1 s#. What are the object's average speed and velocity?

##### 1 Answer

May 9, 2018

#### Explanation:

While going North, the object goes

While going South, the object goes

For **average speed** , direction does not matter, just total distance and total time.

For **average velocity**, direction **does** matter, so we need the resultant of all displacements (which are vectors) and total time.

I hope this helps,

Steve