Solve with RungeKutta fourth order method in excel software

The following equation can be used to model the deflection of a sailboat mast subject to a wind force: dy f(z) (L z)2 dz2 2E1 - where f(z) = wind force, E = modulus of elasticity, L = mast length, and I = moment of inertia. Note that the force varies with height according to 2007 f(z) = e-27/30 5 + z = Calculate the deflection by Runge-Kutta fourth Order method in excel saftware if y= 0 and dy/dz = 0 at z=0. Use parameter values of L = 30, E = 1.25 x 108, and I = 0.05 for your computation. (Step size AL=1,16 = 0, L 30 = 30) =