The engines on a submarine of mass m deliver a maximum driving force of Fnewtons. The water resists the motion with a force proportional to the square of the speed 1;. d 1 (a) Explain why 01: = (F keg] 1Jvhere k is a positive constant. 771 (b) The submarine increases its speed from 1:1 to rig. Show that the distance travelled during this period is m 1 Fkle xoge Fiwg