http://goff-j.web.lynchburg.edu/Goff_Carre_AJP_2009.pdf
here is a PDF of Trajectory analysis of a soccer ball by
John Eric Goff
Department of Physics, Lynchburg College, Lynchburg, Virginia 24501
Matt J. Carré
Department of Mechanical Engineering, University of Sheffield, Sheffield S1 3JD, United Kingdom
enjoy
