4. Create a Simulink model that solves the 2nd-order ODE below. Label all blocks and annotate all signal lines. Use a fixed-step solver with a fixed-step size of 0.01. Set your simulation to run for time 1-20. d²x dx +4 dt² dt 2x² + cos (5t)f(t) = 0 where f(t) is a step function with a step time of 1, an initial value of 0, and a final value of 4; and the initial conditions are x(0) = 0.7 and x(0) = 0.2.

Fig: 1