Câu 1:Lò xo có chiều dài tự nhiên là 10cm a. Kéo dãn lò xo bằng một lực thì chiều dài lò xo là 13cm. Tính độ biến dạng của lò xo khi đó? b. Nếu biết độ biến dạng của lò xo là 4cm thì khi đó lò xo có chiều dài là bao nhiêu? Ai làm giúp em với em cảm, ơn nhiều

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