Question

Michael's tennis serve is 105 mph. At the same rate, how many feet would his serve travel in one second to the nearest foot?

Answer 1

old question but will respond so this can be closed

they want to convert from miles per hour to feet per second

so we have to do two conversions: miles --> feet, and hours --> second

we can accomplish this through dimensional analysis

Answer 2

we can write the conversion factor 5280 feet/1 mile. notice how miles is on the bottom so we can cancel out miles, and we are left with feet/hour

repeat the same logic with seconds and hours. find out how many seconds are in 1 hour, and write the appropriate conversion factor that will let you cross out hours.