Final answer:
Using the information of traveling 30 miles in half an hour, the car's average speed is calculated to be 60 mph. Instantaneous speed and acceleration cannot be determined from the provided information; class and usability also cannot be discerned.
Step-by-step explanation:
From the given information that a car was able to drive 30 miles in half an hour, we can determine the car's speed. Speed is defined as the distance traveled divided by the time it takes to travel that distance. In this case, speed can be calculated by dividing 30 miles by 0.5 hours (or 30 minutes), resulting in a speed of 60 miles per hour (mph).
This is an example of average speed as it represents the distance covered over a period of time. On the other hand, instantaneous speed is the speed of the car at a specific instant in time, as displayed on a speedometer.
A car's acceleration refers to the rate at which its speed changes over time. To measure acceleration, one would typically drive the car at a constant speed (e.g., 50 mph) and then increase the speed (e.g., to 60 mph) while recording the time it takes for this change to occur.
However, the given information does not provide enough details to determine acceleration since we would need to know the changes in speed and the time interval for each change.
The class and usability of the car cannot be determined from the given information, as they pertain to different aspects such as the car's design, features, and functions rather than its motion characteristics.