To actually calculate it exactly would take a lot of math. I don't have a container to measure the density of a Baseball and the air temp where you are also depends on it. But, to give you the exact average 1 mph per 7 feet. If you are low sea level and very humid out as much as 1 mph per 6 feet. On a mountain or high altitude as low as 1 per 8 ft. So just say 1 mph per 7 feet. Hercules71185
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