EJSS Projectile customized after brownbag

EJSS Projectile customized after brownbag

http://weelookang.blogspot.sg/2014/09/ejss-projectile-customized-after.html
https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_model_projectile/projectile_Simulation.xhtml
source: https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_src_projectile.zip
authors: lookang
author of EJS 5: Paco.

http://weelookang.blogspot.sg/2014/09/ejss-projectile-customized-after.html
https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_model_projectile/projectile_Simulation.xhtml
source: https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_src_projectile.zip
authors: lookang
author of EJS 5: Paco.

made changes

1. added TE
2. added legend for the color
3. added ref. PE = 0 line GREEN  (discussion with ravi, MTT)
4. noted the decrease in KE after each collision with the floor ( discussion with boon leong)
5. made ref PE = 0 to coincide with C.G. of the ball
6. made ball drawing 35x35 pixel smaller to reflect the floor at y= yground +sizey/2
7. made _pause() if ball y lower than the floor