### Home > CAAC > Chapter 10 > Lesson 10.4.3 > Problem10-151

10-151.

How does the person's distance from the start point change?

The person starts walking away from the detector and then turns around and starts walking slightly faster towards it.

The person's distance from the start point does not change. What does this mean?

This is not possible because the motion detector cannot simultaneously record two different distances.