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## Homework Statement

i was told that

For a given fluid the velocity of fluid in contact with with solid boundary is equal to the velocity of solid boundary in a book . In another book , I was told that the velocity of fluid at the solid boundary is 0 , which is correct ? can someone explain ?

## Homework Equations

## The Attempt at a Solution

imo , the first one is wrong , the second statement is correct , am i right ? can someone expalin pls?