I'm not sure I understand these but this looks useful for baseball:
Every SHOOTING CHRONY® measures the speed of bullets, arrows, shotgun & airgun pellets, paintballs, et cetera, from 30/fps. to 7000/fps. and with better than 99.5% accuracy.
The earliest efforts to measure baseball speed around WWI gave results in Feet Per Second rather than MPH. A fastball goes about 100 feet per second.