Atrain engineer drives a train 235 km north along a straight track . then he drives the train back south 126 km . finally , he drives north again 45.0 km to his final destination . what is the engineer total displacement .

let here North direction is along +Y and South direction is along -Y

similarly East direction is towards +X and west direction is towards -X

now it is given that

first it moves 235 km north

then it moves back 126 km south

then again he moves north

now the total displacement is given as

so final displacement of train is 154 km North

the answer is d. 4

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