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Math Help - Physics

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    Physics

    A train is traveling along a straight, horizontal track at a constant speed that is only slightly less than that of light. An observer on the ground and an observer in the train each measure the distance between two posts located along the tracks. The observer on the ground obtains ____ the observer in the train.
    a. a longer length than
    b. the same length as
    c. a shorter length than
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