I have done this experiment and my results were 7 times. I did the experiment 3 times just to be sure. Things could change the outcome of the amount of times the ball bounced such as wind, weight, warmth etc...
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When the ball hits the ground some energy is given up during the compression and decompression of the ball. The difference between bouncing it on concrete and sand. The sand almost stops the ball while the concrete bounces it back up fairly well. The sound it makes requires energy. Also gravity would rather have an object falling towards the larger mass than away.
3 ft
Depends on the brand of ball, and whether it's labeled as 'soft' or 'super long'.
Not all super balls bounce the same way. We would have to know more about the ball, such as its size and the material it's made of.
This cannot be answered. It all depends on how hard the ball was bounced.