45 kilometers/second (1 mile/1.609 kilometers)(5280 feet/1 mile)
= 147,669 feet per second
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840 feet/40 seconds = 21 feet per second.840 feet/40 seconds = 21 feet per second.840 feet/40 seconds = 21 feet per second.840 feet/40 seconds = 21 feet per second.
30 kilometers per hour = 27.34 feet per second.
315 feet in 9 seconds = about 35 feet per second.
It is 475200 feet per second!
176 feet per second. Multiply 1 mile in feet (5280 feet) by 120MPH (literally 120 miles per hour) = 633600 feet per hour Multiply to get how many seconds in an hour (60 minutes per hour X 60 seconds per minute) = 3600 633,600 feet divided by 3600 seconds = 176 feet per second