Final answer:
The car's acceleration is 10.58 m/s².
Step-by-step explanation:
To find the car's acceleration, we can use the formula:
acceleration = change in velocity / time
In this case, the car's initial velocity is 0 m/s and its final velocity is 40 m/s. The time it takes to reach this velocity is 3.78 seconds.
Substituting these values into the formula:
acceleration = (40 m/s - 0 m/s) / 3.78 s = 10.58 m/s²
Therefore, the car's acceleration is 10.58 m/s².