An object travels North at #4 m/s# for #9 s# and then travels South at #1 m/s# for # 6 s#. What are the object's average speed and velocity?

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Answer 1 · 2017-09-08T06:28:42

The average speed is #=2.8ms^-1#
The average velocity is #=2ms^-1#

The total distance travelled is #d=(4*9)+(1*6)=36+6=42m#

The total time is #t=9+6=15s#

The average speed is

#barv=d/t=42/15=2.8ms^-1#

The displacement is

#Deltax=(4*9)-(1*6)=36-6=30m#

The average velocity is

#=(Deltax)/t=30/15=2ms^-1#