We have: $$ s(t) = 4u(t)−u(t−1)−2u(t−2)−2u(t−3.5)+2u(t−4) $$ where $u$ is the Heaviside function.
I had to draw the graph and find the minimum sampling period so we wont have loss of signal. I have drawn the graph.
$t=kT$ where $T$ is the sampling period.So $T=t/k$ so how do I find T?