Consider a cylindrical tank of radius $1 \mathrm{~m} is filled with water. The top surface of water is at 15 \mathrm{~m} from the bottom of the cylinder. There is a hole on the wall of cylinder at a height of 5 \mathrm{~m} from the bottom. A force of 5 \times 10^{5} \mathrm{~N} is applied an the top surface of water using a piston. The speed of ifflux from the hole will be : (given atmospheric pressure \mathrm{P}_{\mathrm{A}}=1.01 \times 10^{5} \mathrm{~Pa}, density of water \rho_{\mathrm{W}}=1000 \mathrm{~kg} / \mathrm{m}^{3} and gravitational acceleration \mathrm{g}=10 \mathrm{~m} / \mathrm{s}^{2}$ )