Final Answer:
The race car, starting from rest, reaches a speed of 20 m/s after accelerating at 4 m/s for 50 meters. The acceleration contributes to a linear increase in speed.
Step-by-step explanation:
As the race car starts from rest and undergoes constant acceleration, the final speed is determined by the distance traveled and the acceleration applied. In this scenario, the car accelerates at 4 m/s for a distance of 50 meters. The final speed of 20 m/s is achieved through this acceleration.
Acceleration is the change in velocity over time, and the car's speed increases by 4 m/s each second. After covering 50 meters, the car attains a speed of 20 m/s. This indicates a linear relationship between the acceleration and the distance traveled.
The car's initial velocity is zero, given that it starts from rest. The entire process follows the principles of kinematics, which describe the motion of objects. The given values of acceleration and distance allow us to deduce the final speed without explicitly using the formula.
Understanding the physics involved in motion helps us interpret how different factors contribute to the final outcome. In this case, the acceleration over a specific distance results in a determined speed, and once attained, the car maintains this top speed.