function [J] = sect_3_prob_2_part_b_J_min_fn(alpha_0, alpha_1, t_0, t_f, v_0, gamma_0, gamma_d, d_gamma)
%   
% Written by:
% -- 
% John L. Weatherwax                2006-08-28
% 
% email: wax@alum.mit.edu
% 
% Please send comments and especially bug reports to the
% above email address.
% 
%-----

% First integate the given differential equations from t=0 to t=t_f: 
% 
sol = ode45( @(t,x) sect_3_prob_2_part_b_J_ode_fn(t,x, alpha_0,alpha_1), [t_0,t_f], [v_0;gamma_0] );

gamma_t = sol.y(2,:); % extract gamma(t) 

% Second evaluate the expression for J: 
% 
J_part1 = d_gamma * ( gamma_t(end) - gamma_d )^2;
J_part2 = alpha_0^2 * t_f + alpha_0 * alpha_1 * t_f^2 + ( alpha_1^2 ) * t_f^3 / 3.0; 
J       = 0.5 * ( J_part1 + J_part2 );