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