Well it depends on the tennis ball and also how high you bounce . You never know . Unless you measure of corse ! Well I guess the world will never know ! Or will it??
My favorite way is to tape several sheets of graph paper on a big cardboard piece for a background (with marks measuring the height from the bouncing spot in a few places), and put a video recorder...
a tennis ball's bounce depends on what type it is and how much it has been used, A good tennis ball is fuzzy and when you squeeze it in your hand it doesn't let you bend it in that much. Basically...