Một lò xo có độ cứng k = 250N/m được đặt nằm ngang một đầu gắn cố định một đầu gắn Một vật có khối lượng m =0,1 kg có thể chuyển động ma sát trên mặt phẳng nằm ngang kéo vật lệch khỏi vị trí cân bằng một đoạn benta l =5cm rồi thả a, vận tốc lớn nhất mà vật có thể được là bao nhiêu b, tại vị trí nào thì động năng bằng thế năng Có tóm tắt ạ

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