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The relative velocity of the toy car is 0.5 m/s from the perspective of _____.

Here is the full question: A girl is a passenger aboard a moving train. The girl has a toy wind-up car that she lets travel down the aisle of the train. From experience, the girl knows that the wind-up car travels at 0.5 m/s. The relative velocity of the toy car is 0.5 m/s from the perspective of _____.

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"from the perspective of the train."  [the girl already knows from experience that the wind-up car travels at 0.5 m/s relative to her and she is a passenger on the moving train (so, she is travelling at exactly the same speed and in the same direction as the train).]