Correct Answer is: (c) g/N
v = √(2g. h/2) = √(g/h).
Let α be the area of the ****. The volume of the liquid discharged per unit time is vα.
The mass of the liquid discharged per unit time is ρvα.
The momentum of this liquid per unit time is ρv2α, which gives the force exerted by the liquid.
∴ F = ραv2 = ραgh.
The mass of the liquid in the tank is m = Ahρ.
Initial acceleration of the tank, F/m = αg/A = g/N.