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 on 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 $$g = 10 \ m s^{-2}$$)