$13.$ Water flows down a $1$ m hill through a pipe that widens from $5$ cm $2$ at the top ofthe hill to $15$ cm $2$ at the bottom of the hill. The pressure at the top of the hill is $6\mathrm{.}5$x $104$ Pa$.$ It exits the pipe into air at the bottom of the hill. What is the velocity ofwater in the pipe at the top and bottom of the h