I have this project that involves the runge-kutta method, and I honestly have no clue what I am doing. I never learned about this before, and I don't know much about ordinary differential equations. I am learning all of this next semester but it is required information for this project. In my project, I have to model the movement of a test charge through an electric field and program it onto fortran 90. I know that the Lorentz equation is F=q(E+vxB), and also F=ma (as a special case), and I can equate the two to find acceleration. I have no idea how I would set this up as an ODE and then use the runge-kutta method. I need to do this so that I can plot a position vs. time graph of the test charge. Can someone please help me out?