You sit in a sail bogey of mass 4263 kg that travels along a railroad track, slowed by rolling friction and pushed forward by a wind that produces a force of F(x) = 716 N - ( 2.25 N/m) x that reduces as it traverses a bridge. The combination of these two forces results in a velocity function of v(t) = 11 m/s - ( 0.43 m/s2 ) t2 where both x and t are measured from the place and time that the train gets on the bridge. I. Kinematics (a) What is the time it takes for the bogey to come to a stop? r=_ (b) How far has the bogey traveled? o=x II. Energetics (a) What is the initial kinetic energy of the system? K