If $4 \mathrm {~J}$ Of Work Are Needed to Stretch a Spring From

question 57

Multiple Choice

If $4 \mathrm {~J}$ of work are needed to stretch a spring from $10 \mathrm {~cm}$ to $12 \mathrm {~cm}$ and another $20 \mathrm {~J}$ are needed to stretch it from $12 \mathrm {~cm}$ to $14 \mathrm {~cm}$ , what is the natural length of the spring? Round the answer to nearest integer.

• A) \(12 \mathrm {~cm}\)
• B) \(8 \mathrm {~cm}\)
• C) \(13 \mathrm {~cm}\)
• D) \(11 \mathrm {~cm}\)
• E) \(10 \mathrm {~cm}\)

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