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100 feet in 10 seconds gives an average speed of 10 feet per second.
Its speed is 6 feet per second. Its velocity is 6 feet per second in whatever direction it's going.
315 feet in 9 seconds = about 35 feet per second.
The speed keeps increasing. At any instant, the speed is 32.2 feet per second faster than it was 1 second earlier. That number is called the "acceleration of gravity".
The speed is 4.1 miles per hour.