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luutrongduc90
2 năm trước
Câu 67. Động năng của vật 2 gấp đôi động năng vật 1 khi A. m1 = 2m2, v2 = 2v1. B. m2 = 2m1, v1 = 2v2. C. m1 = m2, v2 = 2v1. D. m1 = m2, v1 = 2v2. Câu 68. Động năng của vật 2 gấp 3 động năng vật 1 khi A. m1 = 3m2, v2 = 3v1. B. m2 = 2m1, v1 = 3v2. C. 3m1 = m2, v2 = 2v1. D. m1 = 3m2, v1 = 2v2.
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