The work done by the impeller of a centrifugal pump on water per second per unit weight of water is given by
1
\(\frac{1}{g}{V_{w1}}{u_1}\)
2
\(\frac{1}{g}{V_{w2}}{u_2}\)
3
\(\frac{1}{g}\left( {{V_{w2}}{u_2} - {V_{W1}}{u_1}} \right)\)
4
\(\frac{1}{g}\left( {{V_{w2}}{u_2} + {V_{W1}}{u_1}} \right)\)
5
\(\frac{1}{g}{V_{w2}}{u_1}\)