An object travels North at # 2 m/s# for #6 s# and then travels South at # 7 m/s# for # 9 s#. What are the object's average speed and velocity?

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Answer 1 · 2017-08-14T06:42:50

The average speed is #=5ms^-1#
The average velocity is #=3.4ms^-1#

The total distance travelled is #d=(2*6)+(7*9)=12+63=75m#

The total time is #t=6+9=15s#

The average speed is

#barv=d/t=75/15=5ms^-1#

The displacement is

#Deltax=(2*6)-(7*9)=12-63=-51m#

The average velocity is

#=(Deltax)/t=|-51|/15=3.4ms^-1#