Một chất điểm dao động điều hòa với phương trình $x=6\cos \left(\pi t+\frac{\pi }{2}\right)$ cm. Ở thời điểm t = 0,5 s li độ và vận tốc của chất điểm là

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• Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions:

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