added more visual stuff

1. added graphs of all quantities vs s_y, due to pedagogy used in multiple representation.
2 did not add mathematical equations because there are too many and no more space on the applet, my suggestion is to get students to do a data analysis and decide the curve fit needed to derive the mathematical model equation for each segment of the motion themselves, something like using the Tracker. check out http://weelookang.blogspot.com/2011/02/ball-throw-vertically-up-video-analysis.html for details
09March 2011
added boolean variables to applet to fix error
added // sound effect added despite the energy conservation
Toolkit.getDefaultToolkit().beep(); // taken from http://www.compadre.org/OSP/items/detail.cfm?ID=8385&Attached=1
//Ceiling Bounce Model written by Wolfgang Christian
added activity to support the same journal paper multiple representation as below
19 march 2011
made the yground cannot be above ball (x,y)
improve the ymin code to involve yground