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An object travels North at # 8 m/s# for #3 s# and then travels South at # 6 m/s# for # 8 s#. What are the object's average speed and velocity?

Answer 1

Charlotte Aaron

The average speed is #=6.55ms^-1#
The average velocity is #=-2.18ms^-1#

The total distance travelled is #d=8*3+6*8=72m#

The total time is #t=3+8=11s#

The typical pace is

#barv=d/t=72/11=6.55ms^-1#

The change in location is

#Deltax=8*3-6*8=-24m#

The mean speed is

#=(Deltax)/t=-24/11=-2.18ms^-1#

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Answer 2

Elena Albarran

Average speed: 5.4 m/s; Average velocity: -1 m/s North

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.