An object travels North at # 7 m/s# for #3 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 · 2017-08-05T20:10:23

The average speed is #=3ms^-1#
The average velocity is #=1.67ms^-1#

The total distance travelled is #d=(7*3)+(1*6)=21+6=27m#

The total time is #t=3+6=9s#

The average speed is

#barv=d/t=27/9=3ms^-1#

The displacement is

#Deltax=(7*3)-(1*6)=21-6=15m#

The average velocity is

#=(Deltax)/t=15/9=1.67ms^-1#