$v_2$ represents the velocity of a fluid at a specific point within a flow system, typically denoting a location downstream or at a different pressure point than $v_1$. Understanding $v_2$ is crucial for applying Bernoulli's equation, which relates the velocities and pressures at two different points in a streamline flow. This concept helps illustrate how changes in pressure can influence the velocity of the fluid, providing insights into various fluid dynamics applications.
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