Runge-Kutta problem

[maxtor101]

Hey all!

I'm trying to use the Runge-Kutta method on this differential equation but I am getting nowhere and it's starting to confuse me :S

Any help would be greatly appreciated!


\frac{dx_{1}}{dt} = g_{2} \frac{y_{2} - y_{1}}{{|r_{2} - r_{1}|}^2}

[AlephZero]

Give us a clue: tell us how {y}_{1}, y_2, r_1, r_2, and g_2 depend on x_1 and t.

(If they were all constants, the solution is rather trivial!)

[EnumaElish]

In addition to AlephZero's question, is there a simultaneous equation for dx2/dt ? (If not, why is there subscript on x?)