An object travels North at # 2 m/s# for #7 s# and then travels South at # 4 m/s# for # 4 s#. What are the object's average speed and velocity?

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Answer 1 · 2017-09-15T05:06:35

The average speed is #=2.73ms^-1#
The average velocity is #=0.18ms^-1#

The total distance travelled is #d=(2*7)+(4*4)=14+16=30m#

The total time is #t=7+4=11s#

The average speed is

#barv=d/t=30/11=2.73ms^-1#

The displacement is

#Deltax=(2*7)-(4*4)=14-16=-2m#

The average velocity is

#=(Deltax)/t=|-2|/11=0.18ms^-1#