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If v1 and v2 are the velocities of flow before and after sudden enlargement in a pipe, the head loss given by Carnot and Borda equation, is

(v22 - v12)/2g
(v1 - v2)2/2g
(v2 - v1)2/2g
(v1 + v2)2/2g.

Correct Answer: (v1 - v2)2/2g

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