An object travels North at # 8 m/s# for #8 s# and then travels South at # 3 m/s# for # 2 s#. What are the object's average speed and velocity?

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Answer 1 · 2017-10-06T05:48:36

The average speed is #=7ms^-1#
The average velocity is #=5.8ms^-1#

The total distance travelled is #d=(8*8)+(3*2)=64+6=70m#

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

The average speed is

#barv=d/t=70/10=7ms^-1#

The displacement is

#Deltax=(8*8)-(3*2)=64-6=58m#

The average velocity is

#=(Deltax)/t=|58|/10=5.8ms^-1#