An object travels North at #5 m/s# for #8 s# and then travels South at #4 m/s# for # 2 s#. What are the object's average speed and velocity?

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Answer 1 · 2017-08-05T06:38:17

The average speed is #=4.8ms^-1#
The average velocity is #=3.2ms^-1#

The total distance travelled is #d=5*8+4*2=40+8=48m#

The total time is #t=8+2=10s#

The average speed is

#barv=d/t=48/10=4.8ms^-1#

The displacement is

#Deltax=5*8-4*2=40-8=32m#

The average velocity is

#=(Deltax)/t=32/10=3.2ms^-1#