# An object travels North at # 8 m/s# for #3 s# and then travels South at # 7 m/s# for # 8 s#. What are the object's average speed and velocity?

##### 1 Answer

Average Speed

Average Velocity

#### Explanation:

**distance** over time whereas

**displacement** over time.

Total distance travelled- which is independent of the direction of motion- in

Average speed

The two components of the final displacement, *normal* (a.k.a., *perpendicular* ) to each other.

Hence, directly apply the Pythagorean theorem to find the

displacement from the initial position after

#=sqrt((8*3)^2+(7*8)^2)=8sqrt(58)color(white)(l)"m"#

Average velocity