1. The problem statement, all variables and given/known data Cross sectional area: 4.5x10^-2 m Speed: 3.5ms-1 Density of sea water: 1030 kg m-3 Calculate the mass of water propelled backwards in 1 s. 2. Relevant equations 3. The attempt at a solution Could someone just guide me through it, maybe give me a starting point like which equation to use...Im unsure how to do this? My thought was that its related to the power equation?