Ascale model of 1: 25 of a ship has a submerged area of 6 m2 a length of 5 m in which a drag force (ed) of 25 n is measured when an experiment is carried out in water with a speed of 1.2 m/s. calculate the total drag force in the prototype. remember that the total drag force is due to the friction forces plus the pressure forces. the friction force can be estimated by the following relationship where coefficient cf= 0.0735 /. assume that the dynamic viscosity is 0.001 pa-s and density of 1030 kg / both for the model and the prototype.