It is 475200 feet per second!
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36 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.840 feet/40 seconds = 21 feet per second.
90 miles is 475200 feet per hour, = 132 feet per second. The ball can travel 6 times 22 feet in 1 second, so 22ft is travelled in 1/6 seconds
Multiply by 3600.
315 feet in 9 seconds = about 35 feet per second.