An object travels North at 7 m/s for 8 s and then travels South at 6 m/s for 4 s. What are the object's average speed and velocity?

1 Answer
Aug 14, 2017

The average speed is =6.67ms^-1
The average velocity is =2.67ms^-1

Explanation:

The total distance travelled is d=(7*8)+(6*4)=56+24=80m

The total time is t=8+4=12s

The average speed is

barv=d/t=80/12=6.67ms^-1

The displacement is

Deltax=(7*8)-(6*4)=56-24=32m

The average velocity is

=(Deltax)/t=|32|/12=2.67ms^-1