An object travels North at #8 m/s# for #5 s# and then travels South at #6 m/s# for # 7 s#. What are the object's average speed and velocity?

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Answer 1 · 2017-07-19T15:27:28

The average speed is #=6.83ms^-1#
The average velocity is #=0.17ms^-1#

The total distance travelled is #d=8*5+6*7=82m#

The total time is #t=5+7=12s#

The average speed is

#barv=d/t=82/12=6.83ms^-1#

The displacement is

#Deltax=8*5-6*7=-2m#

The average velocity is

#=(Deltax)/t=2/12=0.17ms^-1#