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ngoclinhpru1970
2 năm trước
Một tên lửa có khối lượng tổng cộng là 10 tấn đang bay với vận tốc 200m/s thì phụt ra phía sau khối lượng khí 2 tấn với vận tốc 300m/s. Tìm vận tốc của tên lửa sau khi phụt khí với giá thiết toàn bộ khối lượng khí được phụt ra cùng một lúc.
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