Please forgive my ignorance on what may be simple topics for most of you. I'm just trying to get my head conceptually around a ball launching pet project I'm fiddling with. If you take a rubber (tennis) ball, say of 5 oz mass, and blast it with a sprung plate moving at 70 mph, will the ball take off faster than 70 mph? Seems like it would due to the compression and rebound of the ball. How would you quantify that? Along the same lines, which would yield a faster ball launch -- pushing it rapidly to 70 mph (so that it is somewhat compressed to plate during acceleration, or letting the plate get to 70 mph before it impales the stationary, possibly somewhat restrained, ball?