convolution integral, compute the output y$($t$)$ of a continuous$-$time system where the input x$($t$)$ and the impulse response h$($t$)$ are given as: x$($t$)=$ e $^(-$ t$)*$ u$($t$)$ h$($t$)=$ u$($t$)-$ u$($t $-1)$ Here u$($t$)$ is the unit step function.