Water $($density $=1$ x $103$ kg$/$m$3)$ flows at $18$ m$/$s through a pipe with a radius of $0\mathrm{.}04$m$.$

The pipe goes up to the second floor of the building, $3\mathrm{.}0$ m higher, and the pressure

remains unchanged. What is the speed of the water flow in the pipe

on the second floor?

a$.13$ m$/$s

b$.16\mathrm{.}3$ m$/$s

c$.19\mathrm{.}4$ m$/$s

d$.10\mathrm{.}8$ m$/$s

e$.1\mathrm{.}4$ m$/$s