Work of a flying tennis ball We are taught that work $$W=\int_a^b F(x) dx,$$ $F$ is force and $x$ is distance. The question says that a 2 oz. tennis ball is served (by Andy Roddick, I think) at $153 \frac{mi}{hr}$. F...--prophetes.ai

Work of a flying tennis ball We are taught that work $$W=\int_a^b F(x) dx,$$ $F$ is force and $x$ is distance. The question says that a 2 oz. tennis ball is served (by Andy Roddick, I think) at $153 \frac{mi}{hr}$. Find the work required. There is no distance. Is there enough information here?

You need to do work on the ball to give it kinetic energy. $$W = \frac 1 2mv^2 \implies W = 23409\frac{\textrm{oz}\cdot\textrm{mi}^2}{\textrm{h}r^2} $$in Fred Flintstone units.