The only force acting on this system is gravity; assume the concrete piston weighs $9\mathrm{.}5$ million kg$.$ The acting fluid is water and is incompressible. There is a valve stopping the fluid in the system from moving at d$2.$ Answer the next set of questions assuming that the valve just opened and the water is now flowing.$$

$1.$ What is the velocity right after d$2$ but before the turbine?$$

$2.$ What is the pressure directly underneath the concrete piston and the pressure going into the turbine $($if L $=20$ m$)?$

$3.$ Here are the schematics for the turbine.

a$.$ Is the system capable of generating electricity from the turbine?$$

b$.$ If the pipe length is $20$ meters, how long in seconds will the turbine produce energy?