An object travels North at #8 m/s# for #7 s# and then travels South at #4 m/s# for #3 s#. What are the object's average speed and velocity?

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Answer 1 · 2017-06-28T11:35:13

The average speed is #=6.8ms^-1#
The average velocity is #=4.4ms^-1#

The total distance travelled is #d=8*7+4*3=68m#

The total time is #t=7+3=10s#

The average speed is

#barv=d/t=68/10=6.8ms^-1#

The displacement is

#Deltax=8*7-4*3=44m#

The average velocity is

#=(Deltax)/t=44/10=4.4ms^-1#