Final answer:
A car with an acceleration of +2 m/s² is increasing its velocity by 2 m/s every second, indicating that the car is speeding up. Positive acceleration corresponds to an increase in velocity, meaning the car is moving faster in the positive direction.
Step-by-step explanation:
When a car has an acceleration of +2 m/s², it indicates that the velocity of the car is increasing at a rate of 2 meters per second every second. In physics, acceleration is the rate of change of velocity over time. If the car's acceleration is positive, this means that its velocity is becoming more positive in the reference direction, indicating that the car is speeding up. Conversely, a negative acceleration would mean the car's velocity is decreasing, and it would be slowing down.
Concepts of Velocity and Acceleration
Consider a car that accelerates uniformly from an initial velocity of 2 m/s to a final velocity of 10 m/s over 8 seconds. The positive change in velocity here is a demonstration of positive acceleration. Now, if the car slows down to a final velocity over 6 seconds, and its velocity is still positive, it means it is experiencing negative acceleration as it slows down. These situations illustrate how acceleration affects the velocity of an object in motion.