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Yen123
2 năm trước
một vật có khối lượng 3 kg được đặt ở vị trí trọng trường và có thế năng tại đó Wt1 = 500j thả vật rơi tự do đến mặt đất có thế năng Wt1 = -900J a) hỏi vật đã rơi từ độ cao nào so vs mặt đất b) Xđ vị trí ứng vs mức không của thế năng đã chọn c) Tìm vận tốc của vật khi vật qua vị trí này
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