$$f(t) =\begin{cases}t^2 & 0 \le t < 3,\\ 9& t \ge 3\end{cases}$$
- Show that $f$ is of exponential order.
- Express $f$ in terms of the unit step function.
- Find Laplace transform of $f$ and determine the allowed values for
$s$.
I am not sure how to write piecewise function so I cannot begin to solve the problem.
Best Answer
Hint: You can write this using Heaviside Unit Step functions (plot this versus your piecewise function) as:
$$f(t) = t^2(u_0(t) - u_{3}(t)) + 9(u_{3}(t))$$
The Laplace Transform of this is: