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tranhuynhluu789
2 năm trước
Một quả bóng nặng 1kg được ném thẳng đứng lên trên với vận tốc 10m/s tại mặt đất. Chọn gốc thế năng tại mặt đất. Bỏ qua sức cản không khí. Tìm cơ năng của bóng? Tìm độ cao mà vật có thế năng bằng 1/3 động năng?
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