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Question #52,308

Q.A train starts at a distance from a station 'A' with uniform acceleration 'f1' and them stops at station B after traveling a certain distance with uniform retardation 'f2'. the distance between station 'a' and station 'B' is 4 km and it takes 4 minutes to cover the distance. If F1 and F2 are in unit km/minutes2 then 1 2 1 1 + = f f