When the mass is 2kg, the length is 0. 106, and the spring elongation is 0.006 m. ..

When the mass is 4 kg, the length is 0. 1 12, and the spring elongation is 0.012 m. 。

The suspension mass per 1 kg is obtained, and the spring elongation is 0.003 m.

Therefore, when the mass of the suspended object is 9 kg, the elongation of the spring is 0.027 m and the length of the spring is 0.1.27 m. 。

When the length of the spring is 0. 13m, the elongation of the spring is 0.30m, and the mass of the suspended object is 10kg.

.