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207761507276769
2 năm trước
một chiếc cân điều chỉnh kim ở số 0, cho các hạt rơi từ độ cao 1,6m trước khi chạm với vật cân bằng. Nếu mỗi hạt nặng 0,1kg và va chạm xảy ra ở 441/phút thì kim của cân chỉ bao nhiêu kg nếu va chạm các hạt là đàn hồi tuyệt đối?
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