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In incompressible fluid flows steadily through a cylindrical pipe which had a radius 2R at point A and R at a point B further along the flow direction. If the velocity at A is v, then that at B is?

In incompressible fluid flows steadily through a cylindrical pipe which had a radius 2R at point A and R at a point B further along the flow direction. If the velocity at A is v, then that at B is? Correct Answer 4v

Using equation of continuity, a1 v1=a2 v2 π(2R)2 v=πR2 v2 v2=4v.

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