Final answer:
The average acceleration of the car during the 10-second interval is -4 m/s², which indicates that the car is slowing down or decelerating.
Step-by-step explanation:
Average Acceleration Calculation
To calculate the average acceleration of a car during a time interval, you would use the following formula:
a = (Vf - Vi) / t
Where:
Vf is the final velocity
Vi is the initial velocity
t is the time interval
In this case, the initial velocity (Vi) is 60 m/s, the final velocity (Vf) is 20 m/s, and the time interval (t) is 10 seconds. Plugging the values into the formula, we get:
a = (20 m/s - 60 m/s) / 10 s = -40 m/s / 10 s = -4 m/s²
Therefore, the average acceleration of the car during the 10-second interval is -4 m/s², indicating the car is decelerating.