If you have speed in mph and need to convert it to velocity in feet per second, what should you do?

To convert speed from miles per hour (mph) to velocity in feet per second (ft/s), one must recognize the relationship between these units. Specifically, there are 5280 feet in a mile and 3600 seconds in an hour.

To perform the conversion, you take the speed in mph and multiply it by the conversion factor that accounts for these values. The calculation involves the following steps:

1. First, converting miles to feet:

   • 1 mile = 5280 feet

2. Then, converting hours to seconds:

   • 1 hour = 3600 seconds

Combining these, you find that: 1 mph = 5280 feet / 3600 seconds, which simplifies to approximately 1.4667 ft/s.

For practical purposes, this is often rounded to 1.47. Therefore, to convert a speed given in mph to feet per second, you multiply the mph value by 1.47. This is why the correct answer is to multiply by 1.47.

The other options would not yield the correct conversion factor needed to accurately convert speed from mph to ft/s.