speed = 55ft/0.8s = 70ft/s (68.75 rounded to 1 significant figure)
500 feet per second = 340.9 mph
That speed is equal to exactly 21 feet per second. In units with which you may be more familiar, it's 14.318 miles per hour. (rounded)
Not fast at all. 80 mm per second = 0.18 mph.
983,571,056.43045 feet/second in a vacuum.
Approximately 102.3 mph at 150 feet per second.
About 1,076.03 feet per second.
300 feet per second = 204.54 mph
250 feet per second = 170.45 mph
150 feet per second.150 feet per second.150 feet per second.150 feet per second.
120 miles per second equates to 633,600 feet per second.
22 feet per second = 6.7 metres per second = 0.0067 km per second
465 feet per second is equal to about 317 miles per hour.
395 (feet / second) = 269.32 mph
0.024384 kilometers per second
15.0 feet per second is equivalent to: 10.23 miles per hour.
64 feet per second.
It is 2,727 MPH. And that's fast.