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hunghpdp
2 năm trước
Đạn có KL=2kg đang bay theo phương ngang vs v=200m/s thì nổ làm 2mảnh có KL =nhau .Mảnh một bất với v1 =200m/s hợp với phương ngang 1 góc bằng 60° . Hỏi mảnh 2 bay với vận tốc là bao nhiêu?
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