Mashaal Masha
An object hangs from a spring. The formula $l=30+2w$ relates the length $l$, in centimeters, of the spring to the weight $w$, in newtons, of the object. Which of the following describes the meaning of the 2 in this context?
Difficulty: Hard
A: 

The length, in centimeters, of the spring with no weight attached

B: 

The weight, in newtons, of an object that will stretch the spring 30 centimeters

C: 

The increase in the weight, in newtons, of the object for each one-centimeter increase in the length of the spring.

D: 

The increase in the length, in centimeters, of the spring for each one-newton increase in the weight of the object.

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