A pipe having an internal diameter D is connected to another pipe of same size. Water flows into the second pipe through n holes, each of diameter d. if the water in the first pipe has speed v, the speed of water leaving the second pipe is

Explanation

`pi((D)/(2))^(2)v=npi((d)/(2))^(2)v.rArr v.=(D^(2)v)/(nd^(2))`