Here is a modified version from Ballistic pendulum.

/htdocs/ntnujava/ejsuser/37048/users/br/ahmed/Ballisticpendulumedit_pkg/Ballisticpendulumedit.propertiesFull screen applet or Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop. This work is licensed under a Creative Commons Attribution 2.5 Taiwan License
Download EJS jar file(907.1kB):double click downloaded file to run it. (3 times by 2 users) , Download EJS source (3 times by 1 users) View EJS source