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## Radial Force Equation:

This program solves the
differential equation d^{2}**r**/dt^{2} =
-f(r) (**r**/r) where f(r) = (Ar^{m} +
Br^{n}) is an inwardly directed force. You can control the
force law by choosing the four constants A, m, B, and n. Here are some
examples to try: