Final answer:
The average acceleration of the car is -2.4 m/s².
Step-by-step explanation:
To calculate the average acceleration, we need to use the formula:
average acceleration = (final velocity - initial velocity) / time
In this case, the initial velocity is 89 km/h, the final velocity is 37 km/h, and the time is 6.0 seconds.
Converting the velocities to m/s, we have:
initial velocity = 89 km/h * (1000 m/1 km) * (1 h/3600 s) = 24.7 m/s
final velocity = 37 km/h * (1000 m/1 km) * (1 h/3600 s) = 10.3 m/s
Plugging these values into the formula, we get:
average acceleration = (10.3 m/s - 24.7 m/s) / 6.0 s = -2.4 m/s²
Therefore, the correct answer is Option 5: -2.4 m/s².