$[$write code$]$ Provide a short code that solves the below requirement.

$($a$)(16$ points$)[$input$/$output$,$ math expressions$]$ A function $V(r,h)$ that returns the volume $V$ of a right circular cylinder, $($Note: $V=2rh).$ The function should:

Prompt the user to enter the values of $r$ and $h$ in meters $($m$).$

Calculate and display the volume. Don't forget to display the resulting unit appropriately in the output!

$($b$)(9$ points$)[$tracing$]$ What is the output of the following code. Write the output in the boxed region below.