Water at 20 c flows steadily through the box in fig. p3.56, entering station (1) at 2 m/s. calculate the (a) horizontal and (b) vertical forces required to hold the box stationary against the flow momentum. water at 208c flows steadily through the box in fig. p3.56, entering station (1) at 2 m/s. calculate the (a) horizontal and (b) vertical forces required to hold the box stationary against the flow momentum.