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

1 Answer
Narad T.
Jun 12, 2017

The average speed is #=6.5625ms^-1#
The average velocity is #=1.3125ms^-1#

Explanation:

The average speed is #=# total distance#/#time,

The total distance is #d=(7*9)+(6*7)=105m#

The total time is #t=9+7=16s#

The average speed is #=d/t=105/16=6.5625ms^-1#

The average velocity is

#barv=(Deltax)/(Deltat)=(7*9-6*7)/(9+7)=21/16=-1.3125ms^-1#

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