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Motion sensorPositive or negative?

  1. Jan 8, 2012 #1
    1. The problem statement, all variables and given/known data
    1 - A person moving toward the motion sensor with constant velocity..
    2 - A person moving away from the motion sensor with constant velocity..


    2. Relevant 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?
     
  2. jcsd
  3. Jan 8, 2012 #2
    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.
     
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