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ksjdwkan80
2 năm trước
Một vật có khối lượng m = 300g được ném từ mặt đất lên trên với vận tốc bạn đầu 10m/s . Lấy g = 10m/s^2 . Chọn mốc thế năng tại mặt đất. a. Tính cơ năng tại điểm ném vật và độ cao cực đại mà vật đạt được. b. Ở độ cao nào thì thế năng bằng hai lần động năng
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