An object travels North at #1 m/s# for #3 s# and then travels South at #2 m/s# for #7 s#. What are the object's average speed and velocity?

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Answer 1 · 2017-07-10T14:13:06

The average speed is #=1.7ms^-1#
The average velocity is #=1.1ms^-1#

The total distance travelled is #d=1*3+2*7=17m#

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

The average speed is

#barv=d/t=17/10=1.7ms^-1#

The displacement is

#Deltax=2*7-1*3=11m#

The average velocity is

#=(Deltax)/t=11/10=1.1ms^-1#