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Simple accelerating point mass

Example of a simple accelerating point mass in codyn. The model on the left shows how a second order system can be implemented by explicit modeling of a pair of first order equations.

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# Initial position of the point mass
y = 10

# Gravity
g = 9.81

# Mass
m = 0.6

# External force
f = 0

# Acceleration
y'' = "-g + f / m"

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