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 specd of water leaving the second pipe is

• Correct answer
  A

  $\frac{D^2 v}{n d^2}$
• B

  $\frac{D^2 v}{d^2}$
• C

  $\frac{n d^2 v}{D^2}$
• D

  $\frac{d^2 v}{\pi d^2}$

Hence, the correct answer is option: 'A'.