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 There is a solution presented in terms of the slope angle by A. Tan, C. H. Frick, and O. Castillo, “The fly ball trajectory: An older approach revisited,” American Journal of Physics, Vol. 55, pp. 37–40, 1987. But the slope angle is unknown except at the top (zero) of the trajectory, and can be found only numerically or graphically. Therefore, the solution is not in closed form.
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 B. Hayes, “Why W?” American Science, Vol. 93, pp. 104–108, 2005.
 J. Wang, To be published.
 M. Abramowitz and I. A. Stegun, “Handbook of mathematical functions,” Dover, New York, pp. 18, 1970.