Final answer:
The car decelerates while moving in the positive x-direction.
Explanation:
To slow down from 50 MPH to 40 MPH while the x position is increasing means the car is decelerating but moving in the positive x-direction. This scenario indicates the car's velocity is decreasing but the car is still moving forward due to a positive acceleration. Therefore, the correct statement is: the car is decelerating in the positive x-direction.
Learn more about Car motion and acceleration here:
https://brainly.com/question/30556599
