To convert mph into feet per second (fps), you multiply vehicle speed by?

Answer: B — 1.47

To convert miles per hour (mph) into feet per second (fps), you multiply the speed in mph by a specific conversion factor. The correct factor to use is 1.47. This is derived from the fact that there are 5280 feet in a mile and 3600 seconds in an hour. When you perform the conversion, you calculate it as follows: 1 mile = 5280 feet 1 hour = 3600 seconds To convert mph to fps, the calculation is: \[ \text{fps} = \text{mph} \times \frac{5280 \text{ feet}}{1 \text{ mile}} \times \frac{1 \text{ hour}}{3600 \text{ seconds}} \] This simplifies to: \[ \text{fps} = \text{mph} \times \frac{5280}{3600} \] When you divide 5280 by 3600, you get approximately 1.47. Thus, multiplying dx mph by 1.47 converts it into feet per second accurately. Understanding this conversion is essential for various applications in trucking and road safety, where speed needs to be assessed in different units for compliance and safety analyses.