# An object travels North at #7 m/s# for #4 s# and then travels South at #3 m/s# for # 7 s#. What are the object's average speed and velocity?

##### 1 Answer

Sep 30, 2017

Average speed = 4.45 m/s

Average velocity = 0.63 m/s

#### Explanation:

Distance travelled along north = Speed × Time

= 7 m/s × 4s

= 28 m

Distance travelled along south = Speed × Time

= 3m/s × 7s

= 21 m

Average speed =

=

= 4.45 m/s

Displacement = 28 m North - 21 m South

= 7 m north

Average velocity =

=

= 0.63 m/s