A locomotive of mass 90t pulls a train of 10 coaches each of mass 30t,...

A locomotive of mass 90t pulls a train of 10 coaches each of mass 30t, at a speed of 72
km/h on a level track, against frictional resistances totaling 68 N/t.
(a) Find the power of the locomotive and the draw-bar pull on the leading coach (b)
If the rear four coaches are suddenly released, find the speed of the engine and remaining
coaches after 120s, assuming frictional resistance per ton and draw-bar pull remain
unchanged.
(c) Find the speed of the released coaches after 120s, if: (i) the resistance remains
unchanged, and (ii) the resistance varies directly with the speed. (Answer: 530 kW;
20.4 kN; 91.6 km/h; 42.6 km/h; 47.9 km/h).?

1 Answers Available
Asked by Junior on 25th March, 2024