A car travels in a straight line at a constant speed of 20 m/s for 5 s. What is the acceleration of the car?
The acceleration of the car is 0.
When a car travels at a constant speed, it experiences no change in velocity over time, which means its acceleration is zero. Acceleration is defined as the rate of change of velocity, and since the speed remains unchanged at 20 m/s, the acceleration must be 0 m/s².
This choice represents a distance traveled rather than acceleration. The car travels at a speed of 20 m/s for 5 seconds, which results in a distance of 100 meters (calculated as distance = speed × time). Thus, while 100 m is a valid distance, it does not pertain to the concept of acceleration.
This option indicates the speed of the car rather than its acceleration. Speed is a measure of how fast an object moves, whereas acceleration measures the change in speed over time. Since the speed is constant and does not change, acceleration cannot be 20 m/s.
An acceleration of 4 m/s² would indicate a change in velocity, which does not occur in this scenario. The car maintains a constant speed of 20 m/s; therefore, there is no acceleration. This choice incorrectly suggests that the car is speeding up or slowing down, which is not the case.
This is the correct answer, as it accurately reflects that the car experiences no change in its speed over the 5 seconds. Since acceleration is defined as the change in velocity divided by time and there is no change in speed, the acceleration is indeed 0 m/s².
In summary, the car's acceleration is 0 due to its constant speed of 20 m/s over a 5-second duration. This means there is no change in velocity, and thus no acceleration is present. Understanding the difference between speed and acceleration is crucial in physics, as it clarifies concepts related to motion and dynamics.
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