# An object travels North at # 2 m/s# for #1 s# and then travels South at # 4 m/s# for # 9 s#. What are the object's average speed and velocity?

Average velocity =

Average speed =

First, we'll talk about speed, which is defined as the distance traveled in a second.

Total time = 2 + 9 = 11s; total distance traveled = 2 + 36 = 38m.

The "average speed" is 38/11, or 3.45 "ms"^-1.

Mean speed:

The north value will be interpreted as positive and the south as negative (opposite directions, think add and subtract) because the average also takes direction into account.

Time total = 2 + 9 = 11s; total displacement = 2-36 = -34m

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The object's average speed is 3.2 m/s, and its average velocity is -2.2 m/s.

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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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