An object travels North at #5 m/s# for #8 s# and then travels South at #8 m/s# for #5 s#. What are the object's average speed and velocity?

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Answer 1 · 2017-07-10T05:54:43

The average speed is #=6.15ms^-1#
The average velocity is #=0ms^-1#

The total distance travelled is #d=5*8+8*5=80m#

The total time is #t=8+5=13s#

The average speed is

#barv=d/t=80/13=6.15ms^-1#

The displacement is

#Deltax=5*8-8*5=0m#

The average velocity is

#=(Deltax)/t=0/13=0ms^-1#