GATE2013-4

Question

The impulse response a the system is $h(t)$=$tu(t)$.for an input $u(t-1)$, the output is

• A. $\frac{t^2}{2}$u(t)
• B. $\frac{t(t-1)}{2}$u(t-1)
• C. $\frac{(t-1)^2}{2}$u(t-1)
• D. $\frac{t^2-1}{2}$u(t-1)