A spring has a rest length of 9 inches

and a force of 5 pounds stretches

the spring to a length of 20 inches.



How much work is done stretching the spring

from a length of 11 inches to a length

of 15 inches?



Represent the amount of WORK as an integral.


Work = ∫ab\displaystyle {\int_{{\text{a}}}^{{\text{b}}}}   dx

a = inches

b = inches

Then evaluate the integral. Work = inch*pounds

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