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Your guess is correct. If you solve $\dot{v}=T-kv$ you get $v(t)=\frac{T}{k}(1-e^{-kt/m})$ which indeed reproduces your velocity-time plot. The reason the velocity becomes negative is purely a numerical error. If they used a smaller integration time-step then this wouldn't happen; the velocity would decay exponentially.


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Some cellular automata, like the basic rule 110 are universal, i.e., Turing complete. What this means is that you can simulate/emulate any mathematics on them, including any physical theory, including non-local ones. Many people make the mistake of thinking that because cellular automata have local and discrete rules they are limited to simulate only those ...



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