To determine the average speed of the car, we can use the formula for average speed, which is defined as the total distance traveled divided by the total time taken. ### Step-by-Step Explanation: 1. **Identify the Given Values:** - Distance traveled (d) = 150 meters - Time taken (t) = 5 seconds 2. **Use the Average Speed Formula:** The formula for average speed (v) is: \[ v = \frac{d}{t} \] where: - \( v \) is the average speed, - \( d \) is the distance traveled, - \( t \) is the time taken. 3. **Substitute the Values into the Formula:** Plugging in the values we have: \[ v = \frac{150 \text{ meters}}{5 \text{ seconds}} \] 4. **Perform the Calculation:** Now, we perform the division: \[ v = 30 \text{ m/s} \] 5. **Conclusion:** The average speed of the car during the 5 seconds is **30 m/s**. ### Why Option B is Correct: - The calculation shows that the average speed is 30 m/s, which corresponds to option B. This is the correct answer based on the formula and the values provided. ### Explanation of Other Options: - **Option A (20 m/s):** This is incorrect because it underestimates the average speed. If we had calculated \( \frac{150}{7.5} \), we would get 20 m/s, but that does not apply to our scenario. - **Option C (25 m/s):** This option is also incorrect. If we had calculated \( \frac{150}{6} \), we would get 25 m/s, but again, this does not match our time of 5 seconds. - **Option D (15 m/s):** This option is incorrect as well. If we had calculated \( \frac{150}{10} \), we would get 15 m/s, but this does not apply to our scenario either. ### Common Pitfalls: - **Misunderstanding Average Speed vs. Instantaneous Speed:** Average speed is calculated over a time interval, while instantaneous speed refers to the speed at a specific moment. - **Forgetting to Use the Correct Units:** Always ensure that distance is in meters and time is in seconds when calculating speed in m/s. - **Incorrectly Adding Distances or Times:** Ensure that you are using the total distance and total time for the calculation, not partial values. ### Revision Summary: - Average speed is calculated using the formula \( v = \frac{d}{t} \). - For a distance of 150 meters in 5 seconds, the average speed is 30 m/s. - The correct answer is option B (30 m/s). - Always check units and ensure you are using total distance and time for calculations.