You test your reaction time with an online computer program and find that your eye-hand reaction time that is usually between 0.2-0.3 seconds doubles when you talk on your cellphone. Your friend, a medical student, tells you that eye-hand and eye-foot reaction times are different and that the eye-foot reaction time is actually 60% longer due to the longer distance from the brain to the foot. Experiments have found that you need an additional second to make a decision to react in unforeseen situations.
1. From the information obtained by the online reaction time test and your medical student friend, calculate what would be the reaction time for the alert (un-distracted) driver. Give your answser in seconds.
2. Calculate the stopping distance of an alert driver, assuming that he was driving at the current speed limit of 14 m/s and the reaction time of 1.4 s. The car provides 6.0 m/s2 of deceleration. Give your answser in metres.