Solving second order ODEs

Objective: MAIN PROGRAM: %A program to simulate the transient behaviour of a simple pendulum and to create an animation of its motion. clear all close all clc b = 0.05; g = 9.81; l = 1; m = 1 %Initial condition theta_0 = [0;5]; %Time span t_span = linspace(0,20,500); %solve ODE [t,results] = ode45(@(t,theta) ode_func(t,theta,b,g,l,m),t_span,theta_0);…