An object travels North at #8 m/s# for #7 s# and then travels South at #3 m/s# for #9 s#. What are the object's average speed and velocity?

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Answer 1 · 2017-12-15T07:50:41

The average speed is #=5.1875ms^-1#. The average velocity is#=1.8125ms^-1#

Total distance travelled is #d=(8xx7)+(3xx9)=56+27=83#

Total time is #t=7+9=16s#

The average speed is

#barv=d/t=83/16=5.1875ms^-1#

The distance from the starting point is

#d_1=(8xx7)-(3xx9)=56-27=29m#

The time is the same

The average velocity is

#=29/16=1.8125ms^-1#