An object travels North at 8 m/s for 3 s and then travels South at 6 m/s for 8 s. What are the object's average speed and velocity?

1 Answer
Jul 23, 2017

The average speed is =6.55ms^-1
The average velocity is =-2.18ms^-1

Explanation:

The total distance travelled is d=8*3+6*8=72m

The total time is t=3+8=11s

The average speed is

barv=d/t=72/11=6.55ms^-1

The displacement is

Deltax=8*3-6*8=-24m

The average velocity is

=(Deltax)/t=-24/11=-2.18ms^-1