Ralph is driving at 50 mileshour He sees a piano dropping fr

Ralph is driving at 50 miles/hour. He sees a piano dropping from a building onto a street, but it takes 2.5 seconds to note, process this information and then touch the brake pedal. How many feet did Ralph travel during this perception-reaction time?

Solution

Speed of Ralph = 50 miles/hour = 50*1.46667 = 73.3333 ft/second

Time taken by ralph to process the scene = 2.5 seconds

We know that

Speed = Distance/Time

Distance = Speed * Time

Distance = 73.3333*2.5 = 183.33 feet

Therefore, Ralph travelled 183.33 feet during the perception reaction time.