y′′ +y=f(t), y(0)=0, y′(0)=0.
For each of the following choices for f (t):
(a) Try to predict the nature of the solution without solving the problem.
(b) Test your prediction by finding the solution and drawing its graph.
(c) Determine what happens after the sequence of impulses ends.
20 f(t) = (-1)*+1st – kr/2) k=1