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Xiao Jiang and his classmates use a self-made rubber band scale (rubber band can weigh up to 2 kilograms) to weigh objects.
(1), the greater the mass of the object, the longer the elongation length.

(2) Elasticity = 950 ÷ (900 ÷ 9) = 9.5cm.

(3) The quality of the book =18× (900 ÷ 9) =1800g.

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