To find the acceleration of the car, we can use the formula:
\[ \text{acceleration} = \frac{v_{\text{final}} - v_{\text{initial}}}{\text{time}} \]
Given:
- \( v_{\text{initial}} = 0 \) m/s (the car starts at rest)
- \( v_{\text{final}} = 40 \) m/s
- \( \text{time} = 10 \) s
Now, plug in the values into the formula:
\[ \text{acceleration} = \frac{40 , \text{m/s} - 0 , \text{m/s}}{10 , \text{s}} = \frac{40 , \text{m/s}}{10 , \text{s}} = 4 , \text{m/s}^2 \]
Thus, the acceleration of the car is:
\[ \text{acceleration} = 4 , \text{m/s}^2 \]
The correct answer is \( \text{d} , 4 , \text{m/s}^2 \).