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thuhaa012
2 năm trước
câu 6) Thả một vật có khối lượng 500g ở độ cao 450 cm với vận tốc đầu 7,2 km h lấy g=10m/s2 . a) Tìm cơ năng của vật ở độ cao 450cm ? b) tìm cơ năng của vật chạm đất ? c)Tìmm vị trí mà tại đó thế năng bằng động năng nếu chọn gốc thế năng ở mặt đất và bỏ qua sức cản không khí . Giải thích từng bước
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