Answer: the average acceleration of the car is 3.33 mph/s.
Step-by-step explanation:
To find the average acceleration of the car, we can use the formula:
average acceleration = (final velocity - initial velocity) / time
In this case, the initial velocity of the car is 45 mph, the final velocity is 65 mph, and the time taken to reach the final velocity is 6 seconds.
Substituting these values in the formula, we get:
average acceleration = (65 mph - 45 mph) / 6 s
average acceleration = 20 mph / 6 s
average acceleration = 3.33 mph/s (rounded to two decimal places)
Therefore, the average acceleration of the car is 3.33 mph/s.