An object travels North at #8 m/s# for #4 s# and then travels South at #5 m/s# for #3 s#. What are the object's average speed and velocity?

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Answer 1 · 2017-07-18T06:01:36

The average speed is #=6.71ms^-1#
The average velocity is #=2.43ms^-1#

The total distance travelled is #d=8*4+5*3=47m#

The total time is #t=4+3=7s#

The average speed is

#barv=d/t=47/7=6.71ms^-1#

The displacement is

#Deltax=8*4-5*3=17m#

The average velocity is

#=(Deltax)/t=17/7=2.43ms^-1#