Two identical locomotives A and B are coupled with 1 and 2 passenger cars, respectively. S...

Two identical locomotives A and B are coupled with 1 and 2 passenger cars, respectively. Suppose that each passenger car is identical to the others in all respects. If each train (locomotive plus cars) starts from rest, each locomotive exerts the maximum tractive effort (traction force), and assuming that gravity and the tractive effort are the only relevant forces acting on the trains, which of the two trains will have greater kinetic energy after the locomotives have moved 50 m along a horizontal and rectilinear stretch?

Note: Concept problems are about explanations, not computations.

Figure P4.15