# Câu 2: Vật nhỏ chuyển động theo phương trình 2 r t i t j   2 3sin  (SI). Coi rằng π2 = 10.

###### Question:

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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