Question 43

The acceleration of the car is 0 m/s².

Since the car is traveling at a constant speed of 20 m/s, there is no change in velocity. Therefore, the acceleration of the car is 0 m/s².

A) 100 m

This option is incorrect because it represents a distance rather than an acceleration. The problem asks for acceleration, which is defined as the change in velocity over time, not just the distance traveled.

B) 20 m/s

This option is incorrect because it reflects the constant speed of the car, not its acceleration. Acceleration is defined as the rate of change of velocity, and in this scenario, there is no change in velocity to result in acceleration.

C) 4 m/s²

This option is also incorrect because it implies a positive acceleration. Since the car is moving at a constant speed without changing its velocity, the acceleration is zero, not 4 m/s².

D) 0 m/s²

This is the correct answer. The car maintains a constant speed, which means there is no acceleration. Acceleration occurs only when there is a change in velocity, and in this case, since the speed is constant, the acceleration is 0 m/s².

Conclusion

The correct answer is definitive because the car's constant speed indicates that there is no acceleration occurring. All other options incorrectly suggest a distance or a non-zero acceleration, failing to recognize the fundamental concept of constant velocity leading to zero acceleration.