The subway train shown is traveling at a speed of 30 mi/h when the brakes are fully applied on the wheels of cars B and C, causing them to slide on the track, but are not applied on the wheels of car A. Knowing that the coefficient of kinetic friction is 0.35 between the wheels and the track,

Determine
(a) The distance required to bring the train to a stop,
(b) The force in each coupling.

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30 mi/h 40 tons 50 tons 40 tons