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minanguyenbg
2 năm trước
Từ điểm M có độ cao so với mặt đất bằng 0,8m ném lên một vật với vận tốc đầu 2m/s.Biết khối lượng của vật bằng 0.5kg,lấy g=10m/s bình 1)Tính vận tốc vật ngay trước khi chạm đất? 2)Ở độ cao nào thì động năng bằng thế năng?
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