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To solve the given question, we need to calculate the rate of change of speed (which is the acceleration) in the third 5-second interval, which occurs between 10 and 15 seconds, based on the speed-time graph provided.

### Step-by-step breakdown:

1. **Identifying the interval**: The "third 5-second" period refers to the time interval between \( t = 10 \, \text{s} \) and \( t = 15 \, \text{s} \).

2. **Looking at the graph**:
   - The graph shows that at \( t = 10 \, \text{s} \), the speed is \( 12 \, \text{m/s} \).
   - At \( t = 15 \, \text{s} \), the speed is still \( 12 \, \text{m/s} \).

3. **Rate of change of speed (acceleration)**:
   - Acceleration \( a \) is given by the formula:
     \[
     a = \frac{\Delta v}{\Delta t}
     \]
     where \( \Delta v \) is the change in speed and \( \Delta t \) is the change in time.
   - Here, \( \Delta v = 12 - 12 = 0 \, \text{m/s} \) and \( \Delta t = 5 \, \text{s} \).

4. **Calculation of acceleration**:
   \[
   a = \frac{0}{5} = 0 \, \text{m/s}^2
   \]

Therefore, the rate of change of speed (acceleration) in the third 5-second period is **0 m/s²**.

However, looking at the available options (A: 0.5, B: 1.6, C: 2.4, D: 3.2), none of these options reflect the correct answer, which should be **0**. This suggests either a misinterpretation of the question or the graph indicates a different segment of interest, but based on the interpretation given, the acceleration is 0 m/s².

If you'd like, I can clarify this further or explore another aspect of the graph.

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### Related questions:
1. What is the rate of change of speed during the first 5 seconds?
2. How can you calculate the total distance traveled by the toy car during the first 13 seconds?
3. What is the overall average speed of the toy car over the 18 seconds shown in the graph?
4. How would the graph change if the car had constant acceleration throughout the entire time?
5. What does the area under the speed-time graph represent?

### Tip:
When analyzing a speed-time graph, the slope of the graph gives you the acceleration, and the area under the curve gives you the total distance traveled.

Calculate the rate of change of speed, in m/s², of the toy car in the third 5 seconds.

Learn how to calculate the acceleration of a toy car from a speed-time graph in the third 5-second interval. This problem involves kinematics concepts and is ideal for Grades 10-12 physics students.

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