package rk4;

public class Planeta extends RungeKutta{

    public double f(double x, double y, double vx, double vy, double t){
        double r=Math.sqrt(x*x+y*y);
        return (-x/(r*r*r));
    }
    public double g(double x, double y, double vx, double vy, double t){
        double r=Math.sqrt(x*x+y*y);
        return (-y/(r*r*r));
    }

}