Water from a tap emerges vertically down with an initial speed of 
. The cross-sectional area of tap is 
. Assume that, the pressure is constant throughout the stream of water and that the flow is steady. The cross-sectional area of the stream 0.15 m below the tap is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
Decrease in potential energy = Increase in kinetic energy
or 
or 
Now, from continuity equation, 
or 
Velocity has become two times. Hence, area of cross-section will become half, i.e. 
or 
.
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