The following add a spring make it more complicated!

You are welcomed to post your calculation for further discussion.

/htdocs/ntnujava/ejsuser/2/users/ntnu/fkh/ballNrampwspring_pkg/ballNrampwspring.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(1231kB):double click downloaded file to run it. (14 times by 11 users) , Download EJS source (9 times by 6 users) View EJS source