(48G 49G 50G) Runge-Kutta Diff Eqn solver

[rcthacker]

<< U 2 GET 9.8 OVER SQ .005 * - 2 -> ARRY >> 'EQ STO 0 'T STO [0 0] 'U STO

In NUM.SLV F: EQ program Tfinal: 10 U solve: [306..., 43....], expected solution

As a program called function:

With 0 'T STO [0 0] 'U STO

{ T U EQ}
.0001
10
RKF -> Bad Argument Type

What now?