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nieoanhoanh
2 năm trước
Một người đứng trên cầu ném hòn đá có khối lượng 50g theo phương thẳng đứng. Hòn đá lên cao 6m( từ vị trí ném ) thì dừng và rồi xuống. Chọn gốc thế năng tại mặt đất và lấy g=10m/s , thế năng của hòn đá tại vị trí cao nhất bằng?
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