Consider a cascade system with unit step u(t) as input and h1(t) = e-2t(t)u(t) and h2(t) = e-t(t)u(t) respectively. The impulse response of overall system is:

Consider a cascade system with unit step u(t) as input and h1(t) = e-2

1.	Consider a cascade system with unit step u(t) as input and h1(t) = e-2t(t)u(t) and h2(t) = e-t(t)u(t) respectively. The impulse response of overall system is:
A.	h(t) = x2(t) e-tu(t)
B.	h(t) = [e-t – e-2t]u(t)
C.	h(t) = t2 e-2t u(t)
D.	h(t) = 2t2 e-2t u(t)
Answer» C. h(t) = t2 e-2t u(t)