An object travels North at #8 m/s# for #9 s# and then travels South at #4 m/s# for #3 s#. What are the object's average speed and velocity?

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Answer 1 · 2017-07-14T05:25:40

The average speed is #=7ms^-1#
The average velocity is #=5ms^-1#

The total distance travelled is #d=8*9+4*3=84m#

The total time is #t=9+3=12s#

The average speed is

#barv=d/t=84/12=7ms^-1#

The displacement is

#Deltax=8*9-4*3=60m#

The average velocity is

#=(Deltax)/t=60/12=5ms^-1#