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

1 Answer
Narad T.
Jun 17, 2017

The average speed is #=3.27ms^-1#
The average velocity is #=1.82ms^-1#

Explanation:

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

The total distance is #d=(4*7)+(2*4)=36m#

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

The average speed is #=d/t=36/11=3.27ms^-1#

The average velocity is #=# displacement #/time#

#barv=(Deltax)/(t)=(7*4-2*4)/(7+4)=20/11=1.82ms^-1#

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