# An object travels North at # 2 m/s# for #1 s# and then travels South at # 4 m/s# for # 9 s#. What are the object's average speed and velocity?

##### 1 Answer

Average velocity =

Average speed =

#### Explanation:

We will deal with speed first. Speed is how far something travels per second.

North -

South -

Total distance travelled = 2+36=38m

Total time = 2 + 9 = 11s

Average velocity:

As average takes direction into accpunt as well, the north value will be taken as positive, and the south value as negative (opposite directions, think add and subtract).

North -

South -

Total displacement = 2-36=-34m

Total time = 2 + 9 = 11s

As the value for average velocity is negative, and so is the inital south value, the average velocity is therefore