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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The Answer of 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) $10 \mathrm {~cm}$

If 4 J4 \mathrm {~J}4 J Of Work Are Needed to Stretch a Spring From

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