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hoithcsluongtai
2 năm trước
một vật khối lượng 1 kg được thả rơi từ độ cao 20m. Bỏ qua lực cản không khí, lấy g=10m/s2 a, Tính thế năng của vật khi thả và suy ra cơ năng của vật b, Tính thế năng của vật ở độ cao 10m, suy ra động năng của vật tại đây . c, Tính động năng của vật khi chạm đất, suy ra vận tốc của vật khi cham đất?
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