The formula D = R + 0.04r describes the total stopping distance in feet for an average car under ideal driving conditions, where R is the speed of the car in miles per hour. This distance includes the time needed for the driver to react and the time for the car to come to a full stop. Use the formula to fill in this table. I'd suggest using a spreadsheet or the table feature on a calculator, but you can do whatever you want. You're an adult. Speed (mph) Stopping distance (ft.) 5 10 15 20 25 30 35 40 45 50