Câu 2: Vật nhỏ chuyển động theo phương trình 2 r t i t j 2 3sin
(SI). Coi rằng π
2 = 10. Độ lớn
vận tốc của chất điểm tại thời điểm t = 10s là:
A. 24,6 m/s. B. 41,1 m/s. C. 52,3 m/s. D. 18,6 m/s.
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Ответ:
The journey will take 40hours
Explanation: