vin$($t$)=(5$sent$)$u$($t$),$ vc$(0)=0$ and switch K moves from position $"$a$"$ to $"$b$"$ at t$=1$ sec$.$ and from $"$b$"$ to $"$a$"$ at t$=2$ sec$.,$ where it remains for the rest of the time. Find ve$($t$)$ for t $0*$