A motion sensor can accurately measure the distance d to an object repeatedly via the sonar technique. A short ultrasonic pulse is emitted and reflects from any objects it encounters, creating echo pulses upon their arrival back at the sensor. The sensor measures the time interval t between the emission of the original pulse and the arrival of the first echo. Assume that during a lab period the room's temperature increases from 20 deg C to 23 deg C. What percent error will this introduce into the motion sensor's distance measurements?