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Question
The velocity of water at the outer edge of a 60 cm diameter whirlpool, where the water level is horizontal is 2.5 m/s. The velocity of water at a level where the diameter of the whirlpool is 15 cm, is
A.
1 m/s
B.
5 m/s
C.
8 m/s
D.
10 m/s
Answer ( Option D)

10 m/s

Solution

Whirlpool is an example of free vortex formation.
Hence 

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