Motion sensorPositive or negative?

[yypsxxxxxx]

1. Homework Statement
1 - A person moving toward the motion sensor with constant velocity..
2 - A person moving away from the motion sensor with constant velocity..


2. Homework Equations
For both statement above.. Is the velocity positive or negative?


3. The Attempt at a Solution

For the first statement .. i assume that the velocity is positive.. is it right?
For the second .. i assume that the velocity is negative .. is it right?

 

[JHamm]

Really the choice is entirely up to you which one you want to call positive and which you want to call negative, the important part is that the two are different.