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An object travels North at #8 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?

Answer 1

Sebastian Acosta

The average speed is #=7.125ms^-1# and The average velocity is #=1.875ms^-1#

The total distance travelled is #d=8*9+6*7=114m#

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

The average speed is

#barv=d/t=114/16=7.125ms^-1#

The displacement is

#Deltax=8*9-6*7=30m#

The average velocity is

#=(Deltax)/t=30/16=1.875ms^-1#

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Answer 2

William Audy

Average speed: 7.1 m/s Average velocity: 1.4 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.