The work done by 1 kg of steam is

Question

Steam enters a De lavel steam turbine with an inlet velocity of 30 m/s and leaves with an outlet velocity of 10 m/s. the work done by 1 kg of steam is      

(a) 400 N-m                 (b)600 N-m

(c) 800-N-m                (d)1200 N-m