# An object travels North at # 4 m/s# for #1 s# and then travels South at # 2 m/s# for # 4 s#. What are the object's average speed and velocity?

The displacement divided by the total time equals the average velocity:

The total distance traveled is #4m+8m=12m

The distance traveled divided by the time is the average speed.

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The object's average speed is (2.8 , \text{m/s}) and its average velocity is (0.4 , \text{m/s}) south.

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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.

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.

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.

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