An object travels North at #6 m/s# for #2 s# and then travels South at #2 m/s# for #8 s#. What are the object's average speed and velocity?

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Answer 1 · 2017-08-08T06:11:06

The average speed is #=2.8ms^-1#
The average velocity is #=0.4ms^-1#

The total distance travelled is #d=(6*2)+(2*8)=12+16=28m#

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

The average speed is

#barv=d/t=28/10=2.8ms^-1#

The displacement is

#Deltax=(6*2)-(2*8)=12-16=-4m#

The average velocity is

#=(Deltax)/t=4/10=0.4ms^-1#