The acceleration at the exit is

Question

For a fluid flow through a divergent pipe of length L having inlet and outlet radii of R₁ and R₂ respectively and a constant flow rate of Q, assuming the velocity to be axial and uniform at any cross – section, the acceleration at the exit is                                                                    

      (a) $\frac{2Q\left ( R_{1}-R_{2} \right )}{\pi LR_{2}}$                                                    (b) $\frac{2Q^{2}\left ( R_{1}-R_{2} \right )}{\pi LR_{2}}$ 

      (c)$\frac{2Q^{2}\left ( R_{1}-R_{2} \right )}{\pi LR_{2}^{5}}$                                                 (d) $\frac{2Q^{2}\left ( R_{2}-R_{1} \right )}{\pi^{2} LR_{2}^{5}}$