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An object travels North at #8 m/s# for #4 s# and then travels South at #5 m/s# for #7 s#. What are the object's average speed and velocity?

Answer 1

Olivia Askew

The average speed is #=6.09ms^-1#
The average velocity is #=0.27ms^-1#

The total distance travelled is #d=8*4+5*7=32+35=67m#

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

The average speed is

#barv=d/t=67/11=6.09ms^-1#

The displacement is

#Deltax=8*4-5*7=32-35=-3m#

The average velocity is

#=(Deltax)/t=3/11=0.27ms^-1#

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Answer 2

Carson Alexander

The object's average speed is 6.14 m/s and its average velocity is 0.91 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.