calculating velocity of water flow form tap

1. The problem statement, all variables and given/known data

A measuring cylinder collects 475 mL of this
water in a minute. At the top the diameter of the stream is 0.700 cm.

2. Relevant equations

What is the velocity of the stream 20.0 cm below the top?
3. The attempt at a solution
im not sure which formula to use?
i was thinking v=√2gh

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