re-created on the JavaScript format.
customized the gravity field lines
sync numbers with real world data of Earth, g=9.81 m/s^2 and phi =-6.29x10^7 J/kg
This is the full index of Easy Java Simulations (EJS) by author Andrew Duffy, created for first-semester introductory physics. EJS is a modeling tool developed by the Open Source Physics project.
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