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Hi. I am trying to enter some differential equations into a Runge-Kutta 4th order spreadsheet which requires input in the form y' = ...? My differential equations are in the form :

dv

_{x}/dt = -F

_{D}v

_{x}/mv (i.e relate velocity derivative with respect to time to acceleration).

Can anyone please help or point me in the right direction as to how to convert this to to y' = ....? format?

Many Thanks