An object travels North at #6 m/s# for #3 s# and then travels South at #7 m/s# for # 5 s#. What are the object's average speed and velocity?

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Answer 1 · 2017-08-12T05:23:39

The average speed is #=6.625ms^-1#
The average velocity is #=2.125ms^-1#

The total distance travelled is #d=(6*3)+(7*5)=18+35=53m#

The total time is #t=3+5=8s#

The average speed is

#barv=d/t=53/8=6.625ms^-1#

The displacement is

#Deltax=(6*3)-(7*5)=18-35=-17m#

The average velocity is

#=(Deltax)/t=|-17|/8=2.125ms^-1#