1 Multiple Choice 1 point A car travels 150 kilometers west in 3 hours. What is its average velocity? $$ 150 \mathrm{~km} / \mathrm{hr} $$ $$ 50 \mathrm{~km} / \mathrm{hr} $$ $$ 50 \mathrm{~km} / \mathrm{hr} $$ west $$ 150 \mathrm{~km} / \mathrm{hr} $$ west Multiple Choice 1 point When you know both the speed and direction of an object's motion, you know the seed of the object. acceleration of the object. distance the object has traveled. velocity of the object. Multiple Choice 1 point A roller coaster is moving at $$ 10 \mathrm{~m} / \mathrm{s} $$ at the top of a hill and $$ 22 \mathrm{~m} / \mathrm{s} $$ at the bottom of the hill two seconds later. What is the acceleration of the roller coaster? $$ .6 \mathrm{~m} / \mathrm{s}^{2} $$ $$ 6 \mathrm{~m} / \mathrm{s} $$ $$ 6 \mathrm{~m} / \mathrm{s}^{2} $$ $$ .167 \mathrm{~m} / \mathrm{s} $$ 2

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Sure, here are the answers to the multiple-choice questions you provided:

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**1. A car travels 150 kilometers west in 3 hours. What is its average velocity?**

- **Answer:** $$ 50 \mathrm{~km} / \mathrm{hr} $$ west

**Explanation:**  
Average velocity is calculated by dividing the displacement by the time taken.  
$$
\text{Average Velocity} = \frac{150 \mathrm{~km}}{3 \mathrm{~hr}} = 50 \mathrm{~km/hr} \text{ west}
$$

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**2. When you know both the speed and direction of an object's motion, you know the ______ of the object.**

- **Answer:** velocity of the object.

**Explanation:**  
Velocity is a vector quantity that includes both speed and direction.

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**3. A roller coaster is moving at $$ 10 \mathrm{~m} / \mathrm{s} $$ at the top of a hill and $$ 22 \mathrm{~m} / \mathrm{s} $$ at the bottom of the hill two seconds later. What is the acceleration of the roller coaster?**

- **Answer:** $$ 6 \mathrm{~m} / \mathrm{s}^{2} $$

**Explanation:**  
Acceleration is calculated using the formula:
$$
\text{Acceleration} = \frac{\Delta \text{Velocity}}{\Delta \text{Time}} = \frac{22 \mathrm{~m/s} - 10 \mathrm{~m/s}}{2 \mathrm{~s}} = 6 \mathrm{~m/s}^2
$$

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If you have any more questions or need further clarification, feel free to ask!
**1. Average Velocity:** $$ 50 \mathrm{~km} / \mathrm{hr} $$ west **2. Object's Motion:** velocity of the object. **3. Acceleration of the Roller Coaster:** $$ 6 \mathrm{~m} / \mathrm{s}^{2} $$

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