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lienkhuongtptn
2 năm trước
Mọi người giúp em câu này với em đang cần gấp ạ: Thả vật nặng 1 kg rơi tự do từ độ cao 45m so với mặt đất, g = 10m/s2. Bỏ qua sức cản của không khí.a.Tìm cơ năng lúc vật bắt đầu rơi?b. Tính vận tốc của vật khi vật chạm đất
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