# An object travels North at #8 m/s# for #2 s# and then travels South at #3 m/s# for #4 s#. What are the object's average speed and velocity?

##### 1 Answer

Mar 14, 2018

Average speed = 4.67 m/s

Average velocity = 0.67 m/s N

#### Explanation:

Speed, a scalar measurement, is how fast an object moves over a surface; velocity, a vector quantity, is how fast and in what direction.

Speed

=

Average speed =

Velocity is how far an object is displaced from its starting point over a period of time.

The object moved 8m/s North x 2s = 16 m North, then 3m/s South x 4s = 12 m South, for a total displacement of 4 m North over 6 seconds.

Average velocity