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quangluonghb13
2 năm trước
Đạn khối lượng 2kg đang bay theo phương ngang với vận tốc 200 m/s thì nổ thành 2 mảnh có khối lượng bằng nhau. Mảnh 1 bay với vận tốc v1=200m/s hợp với phương ban đầu của viên đạn góc 60°. Xác định vận tốc mảnh bay kia. Mọi người giúp em với ạ.
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