1. jai-alai ball
3. Tip of fencing blade
Here are some of my random thoughts:
1. Does anyone have any idea what a jai-alai ball is?
2. When they say "the tip of a fencing blade" are they referring to a foil, a saber, or an epee? Since the length of a foil differs from that of a saber, it think it matters physically.
3. I think the tip of a fencing blade is the fast moving object an athlet in any sport has to deal with because it needs to travel a lot less distance to reach the opponent than a shuttlecock, or a tennis ball.(NASCAR is not a sport)