JEE Main 2022 · 28 Jul · Shift 2, Physics question 7

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 $5\times10^5$ N is applied an the top surface of water using a piston. The speed of efflux from the hole will be :

(given atmospheric pressure $P_A=1.01\times10^5$ Pa, density of water $\rho_w$ = 1000 kg/m$^3$ and gravitational acceleration g = 10 m/s$^2$)