Hi there all, I'm new to this forum and I really need some help. The question is described as follows: Estimate the maximum "initial velocity" that you can achieve with a regular tennis ball. Presumably there are no variables, nor are there any equations involved. I think that an assumption would be necessary, but how do I solve it? I should also say that this is marked as a "hard question". I would really appreciate if someone helped me, thanks in advance!