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QUESTION
A subject stands motionless in front of a motion sensor the sensor sends out an ultrasound pulse at t=0.0 ms and registers the echoed return of that...
A subject stands motionless in front of a motion sensor the sensor sends out an ultrasound pulse at t=0.0 ms and registers the echoed return of that same pulse at t= 18.6 ms how far away from the sensor is the subject standing?
