Question: Warning using dsolve numeric

Hi !

This is my code : Ass2.mw

and I don't know why I have this warning : Warning, The use of global variables in numerical ODE problems is deprecated, and will be removed in a future release. Use the 'parameters' argument instead (see ?dsolve,numeric,parameters)

and I can't plot my curve after :) If you guys have any ideas... thank you!

 

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