Given, cross-sectional area of the tank, A=0.4m2 Cross-sectional area of the opening at B, A=4cm2=1×10−4m2 Load applied on the top of the tank, m=24kg Height of the water level, h=40cm From the figure,
Using the Bernoulli's principle equation, p0+
mg
A
+ρgh+
ρvA2
2
=p0+
ρvB2
2
⇒0+
(24)10
0.4
+1000×10×0.4+
ρ(0)2
2
=0+
1000×vB2
2
vB=3m/s Hence, the value of v to the nearest integer is 3 .