Although, it is important to note that the CB is in the air only because it is driven down into the table. Most of the initial bounce (that sends the CB airborne) occurs after the CB leaves the tip. The CB loses speed on this initial bounce. Also, if the CB bounces again before reaching the rack, like it usually does for most breakers, the CB will lose more speed on that bounce also. It turns out that because of the bounces, the CB will actually lose more speed (even though it is airborne much of the time) than it would if it were struck with a level cue (if this were possible) where the CB would be sliding the whole way to the rack. In other words, the bouncing and flight does not help (although, it really can't be avoided ... however, it can be minimized by not elevating the cue more than you need to). For those interested, more info on these effects can be found here:If the cue ball is in the air, as is likely for most break shots, it will slow down less.
break CB hop and squat
cue elevation effects
And, for those with strong math and physics backgrounds, a detailed analysis of the effects of hopping on the spin and speed on the CB can be found here:
TP B.10 - Draw shot cue elevation effects
The analysis is applied to draw shots with different cue elevations, but the results also apply to a break shots, where the CB is also doing a combination of hopping and sliding.
Regards,
Dave