Water is flowing through a pipe with a constriction. The area of the narrow section is one$-$half the area of the wide section. If the velocity of the incompressible fluid is $3\mathrm{.}2\frac{m}{s}$ in the wide section, then what is the velocity of the fluid in the narrow section?

Multiple Choice

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$6\mathrm{.}4\frac{m}{s}$

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